Legend:
Old name/Remastered name
[input in duel] [WP/SP cost] [Damage potency]
<<< Effect (if any) >>>
(Tips for challenging arts, or the ones I usually had trouble with) (sparks from/spark difficulty)

It turns out not many people know.
You can press L1+R1+L2+R2+Start to fastquit to Main Menu (and then load quicksave). This helps a lot while looking for spark.

Arranged as they come in-game.

HA stands for HybridArts, which they are.
To clarify: spark works for me if it procc'd within about 10 to 15 minutes. YMMV.
I did not include Bighorn or Blue skellies from Ruins of Han'Nova as a source for sparks (unless they proc for me through multiple runs), since if you need the guide you are probably not really ready to face them.
Just in case you can spark about 3/4 of all weapon arts and most spells (incl. Song of Earth) during first visit of RoHN, but it will not be fast or easy.

For Spell Sparks anima is listed after the character who can learn it, you don't need to spam anima, one use is enough; however I highly recommend to limit anima usage to the one you want to learn.

Since this is important and might be confusing; I edited it a bit for clarity, but: some spells CANNOT be sparked during duels. You just need to use anima (like in party combat) and hope that end screen will bring you the "Wil learned Song of Earth!" message; a.k.a post-battle spark.
This can happen in both duel and party battle modes.

This was more of a simple notes I made while playing the game oh-so-long ago, with information taken from SaGa wiki and, of course, arcanelore and a lot of other places. Kudos to them.

Special: Counter: negates damage, counterattacks opponent.

Karate Punch
[Prepare- Punch] [2] [9]

Backhand
[Feint - Punch] [3] [15]
unavoidable

Rotation Kick
[Charge - Kick] [3] [21]

Bear Paw/Bear Claw
[Charge - Grab] [4] [24]

Brawl
[Punch - Kick - Punch] [4] [27]

Ogre Run/Ogre Rush
[-] [4] [32]
party-only spark/use, Line AoE
(Bear Paw/21, Rotation Kick/22)

Crush Beat/Fists of Fury
[Charge - Punch - Punch] [4] [35]
bonus damage vs Rock

Heart Breaker
[Focus - Grab - Punch] [5] [38]
can inflict Cripple

Arm Hammer
[Charge - Charge - Punch] [5] [45]
can miss

Kick Rush
[Kick - Kick - Kick] [5] [49]

Corkscrew
[Charge - Focus - Punch] [6] [51]

Somersault
[Charge - Kick - Kick] [5] [54]

Triangle Kick
[Feint - Kick - Kick] [6] [57]
unavoidable

Sumo Throw
[Punch - Grab - Kick] [8] [60]
can inflict Cripple

Kitchen Sink
[Charge - Feint - Kick] [7] [62]
can inflict Morale Down

Rolling Thunder
[Focus - Punch - Punch - Punch] [9] [64]

Tumbler
[Feint - Grab - Charge - Grab] [9] [72]
can inflict Cripple
(Sumo Throw/39, Arm Hammer/41)

Cascade Rising/Flash Flood
[Focus - Kick - Kick - Kick] [10] [79]
(Somersault/41)

Dragon Revolution/Triple Dragon
[Feint - Grab - Kick - Punch] [10] [85]
Party-only spark
(Triangle Kick/45, Kitchen Sink/45, Arm Hammer/46, Ogre Run/47)

KAMIKAZE/Rising Sun
[Charge - Charge - Charge - Grab] [10] [90] [1]
1 LP/use
(Ogre Run/45, Crush Beat/49)

Eradication
[Punch - Punch - Kick - Kick] [10] [99]
can deathblow
(Heart Breaker/49, Corkscrew/50)

Notes:
Kamikaze and Eradication can be sparked off Ant Commanders(duel, yes, both)/Queen Pegs.
Cordy seem to have easy time learning Kamikaze even vs blue skellies. Bug?

Special: Deflect, negates damage.

Double Slash/Double Vertical (?)
[Cleave - Cleave] [2] [21]

Cross Slash/Cross Cut (???)
[Slash - Backslash] [3] [25]
bonus damage vs Undead

Strike Slash
[Feint - Slash] [3] [27]
can inflict Stun

Running Slash
[Feint - Backslash] [3] [33]

Smash
[Charge - Cleave] [4] [37]
can miss

Mist Double/Artful Slash (??)
[Feint - Cleave - Slash] [3] [34]

Final Letter/Eulogy (...)
[Backslash - Cleave - Backslash] [6] [39]
can deathblow

Dead End
[Cleave - Backslash - Slash] [7] [42]
can deathblow
(Strike Slash/25, Smash/30)

Double Stroke
[Prepare- Backslash - Backslash] [4] [44]

Cross Break
[Charge - Cleave - Cleave] [5] [46]

Slice & Dice
[Slash - Backslash - Cleave] [5] [49]

Dragon(/'s) Tail
[Feint - Slash - Backslash] [5] [50]

Head Cracker/Vertical Smash
[Prepare- Charge - Slash] [6] [52]
bonus damage vs Insects

Heaven & Hell/Heaven and Earth (...)
[Charge - Slash - Backslash] [6] [55]
can inflict Stun

Head Wind/Headwind Rush
[Feint - Cleave - Backslash] [7] [59]
(Running Slash/33, Mist Double/36 Cross Break/39)

Bull Crush
[Charge - Charge - Cleave] [8] [63]
can miss

Aftervision/Mirage Blade (??)
[-] [7] [55]
party-only spark/use, hits all enemies
(Mist Double/34, Strike Slash/36)

No Moment/No Rhythm (...)
[Prepare- Prepare- Prepare- Slash] [8] [66]
unavoidable

Blade Spray/Thousand Blades
[Prepare- Charge - Charge - Backslash] [9] [71]
fan AoE
(Running Slash/48)

Bear Crush/Ursine Assault (...)
[Charge - Charge - Charge - Cleave] [10] [80]
can miss

Multi-Way/Doppelgangers (why???)
[Slash - Backslash - Cleave - Slash] [13] [88]
(Cross Break/50, Head Wind/55, Slice And Dice/57)

/HA/

Thunder Blade
[Water - Backslash - Cleave] [6] [50]

Tornado Blade/Tornado Slash (?)
[-] [7] [74]
unsparkable, learnt via Johan, target AoE

Gale Blade/Gale slash (?)
[Tree - Cleave - Cleave - Slash] [10] [94]

Notes:
All but Multiway* can be sparked off Buffalo/Armor Bugs in VogCanyon.
Multiway can be sparked off Ant Commanders (duel) or Queen Pegs.
*Gustave can spark multi off ABeetle, but chance is very inconsistent.

Special: Looks cool


Tomahawk
[Charge - Throw] [2] [17]

Heel Crush/Maim
[Focus - Backslash] [2] [19]
can inflict Quick Down

Hyper Hammer
[Charge - Slash] [3] [24]

Wood Cutter/Cut timber (??)
[Charge - Charge - Slash] [4] [27]
bonus damage vs Plants

Fake Out/Time Lapse
[Feint - Backslash - Slash] [3] [34]
unavoidable

Skull Crush/Head Splitter
[Focus - Charge - Slash] [4] [40]
bonus damage vs Skeletons, can inflict Psyche Down

Axel Turn/A.Spin
[Prepare - Charge - Backslash] [5] [44]

Ogre Crossing/Night Crossing
[Prepare - Backslash - Backslash] [4] [49]
(Axel Turn/30, Fake Out/31, Hyper Hammer/33, Heel Crush/33)

Sky Drive
[Charge - Feint - Throw] [5] [53]

Megahit
[Prepare - Charge - Slash] [6] [60]
can miss

Yo-Yo
[Focus - Charge - Throw - Throw] [7] [55]

Wheel Grind/Wheel Strike (?)
[Feint - Slash - Slash - Slash] [5] [61]
(Axel Turn/37, Wood Cutter/38, Ogre Crossing/39)

Flash Trinity/Reverse Delta (???)
[Prepare - Slash - Slash - Backslash] [8] [70]
(Megahit/41, Fake Out/43, Axel Turn/43)

Sky Rendezvous
[Throw - Throw - Focus - Throw] [9] [73]
(Sky Drive/40)

Tornado Divide
[Backslash - Backslash - Charge - Slash] [12] [91]
bonus damage vs Plants, can miss
(Wood Cutter/50, Megahit/50)

/HA/

Fire Wheel
[Flame - Charge - Throw] [5] [45]

All can be sparked off Buffalo/Armor Bugs in VogCanyon.

Special: Windmill, negates damage, TimelyAction! :)

Swing & Stab
[Backslash - Thrust] [2] [18]

Double Thrust
[Thrust - Thrust] [2] [22]

Lawnmower/Grasshopper
[Backslash - Backslash] [4] [27]
bonus damage vs Plants, can inflict stun

Rush/Charge
[Chrage - Thrust] [3] [32]

Skewer
[Charge - Charge - Thrust] [4] [36]

Wave Thrust/Tsunami Strike (whats with all the strikes??)
[Backslash - Thrust - Thrust] [5] [43]

Wide Swing/Reaper (...)
[-] [5] [47]
target AoE, can inflict Stun
(Swing And Stab/23, Thrust/25, Lawn Mower/25)

Brain Shaker/Split Cranium (ffs)
[Focus - Feint - Thrust] [4] [51]
can inflict Psyche Down

Aiming/Aim
[Focus - Focus - Thrust] [5] [55]
unavoidable, pierces defence

Squash/Puncture
[Feint - Backslash - Thrust] [6] [57]
(Lawn Mower/30, Double Thrust/31, Swing And Stab/32)

Shining Arm/Arm of Light
[Charge - Feint - Thrust] [8] [63]
unavoidable

Heavenly Strike
[Backslash - Backslash - Thrust - Thrust] [10] [65]
(Lawn Mower/34, Double Thrust/35)

Beast Lightning
[Prepare - Focus - Backslash - Thrust] [9] [69]
can inflict Magic down
(Brain Shaker/44, Rush/45)

Thousand Cross
[Thrust - Thrust - Thrust - Thrust] [12] [80]
bonus damage vs Undead
(Aiming/50, Shining Arm/50)

Fearless Triple/Triumvirate
[Feint - Backslash - Backslash - Thrust] [14] [88]
(Wave Thrust/50, Squash/50)

/HA/

Snake Blaster
[Water - Charge - Thrust] [6] [72]
bonus damage vs Frogs

Twin Dragon/Dual Dragons
[Flame - Water - Thrust - Thrust] [9] [90]

Jewel Strike
[Stone - Water - Backslash - Backslash] [15] [99]

Relatively easy sparks with Cordy during [Wil's Departure]

Special: Reaction shot, negates damage & attacks opponent. In party can interrupt attack aimed at another character. Basic attacks can miss.

Aim Shot/-ed
[Focus - Shoot] [3] [18]

Random Shot/Rapid Volley
[-] [2] [12]
can miss
(Aim Shot/3, Shoot/7)

Shadow Bind/Shadow Weave
[Feint - Focus - Shoot] [3] [-]
can inflict Cripple/Stun

Arrow Rain/Rain of Arrows
[-] [4] [32]
All opponents, delayed
(Random Shot/17, Shoot/21)

Mind Break/Id Break (LOL)
[Focus - Feint - Quickshot] [5] [36]
can inflict Psyche Down, can miss

Sidewinder
[Focus - Focus - Shoot] [4] [44]
bonus damage vs Frogs
(Aim Shot/25)

Shadow Slayer/Shade Arrows
[Shoot - Focus - Quickshot] [6] [49]
can deathblow

Thousand Needles
[Quickshot - Quickshot - Shoot] [6] [52]
(Aim Shot/33, Mind Break/37)

Rapid Fire/Multi shots
[Charge - Quickshot - Quickshot - Quickshot] [7] [55]

Hi-Speed Arrow/Quick Nock
[Charge - Focus - Focus - Quickshot] [7] [64]
unavoidable
(Aim Shot/44, Shadow Bind-Sidewinder-Shadowslayer/50)

Crystal Prism
[Quickshot - Shoot - Quickshot - Shoot] [9] [84]
can deathblow
(Sidewinder/45, Shadowslayer/45)

/HA/

Bird Hunter
[Flame - Shoot] [2] [31]
bonus damage vs Flying

Poison Arrow
[Water - Shoot] [4] [25]
can inflict Poison

Death Shot
[Tree - Flame - Shoot] [4] [42]
can deathblow

Spark Shot
[Flame - Quickshot - Quickshot] [7] [51]

Windbreaker
[Tree - Charge - Charge - Shoot] [8] [60]

Spectral Shot/Izuna
[Beast - Beast - Beast - Quickshot] [9] [66]

Flame Bird/Fire Bird
[Flame - Beast - Shoot] [9] [33]
LARGE heal on damage/lifesteal


All can be sparked off Buffalo/Armor Bugs in VogCanyon.
Also, Cordy seem to have rather easy time sparking them off blue skellies or even Land Urchin. Weird.

Special: Can rarely block, negates damage.

Roll Beat
[Swing - Swing] [2] [10]
unavoidable, user Psyche Up

Heart Beat
[Focus - Beat] [3] [14]
can inflict Cripple

Lobster Slayer
[Swing - Feint - Swing] [4] [28]
bonus damage vs Crabs

Bone Crush/Bonecrusher
[Focus - Charge - Beat] [4] [31]
bonus damage vs Skeletons, can inflict Morale Down

Head Splitter
[Focus - Focus - Beat] [4] [34]
can inflict Psyche Down

Gong Beat/Gong Ringer
[Prepare - Charge - Swing] [6] [42]

Painful Beat/Cruncher (?)
[Prepare - Focus - Beat] [5] [45]

Rock Crush/Rock Splitter
[Charge - Beat - Beat - Beat] [7] [50]
bonus damage vs Rock

Turtle Killer/Nutcracker
[Charge - Focus - Focus - Beat] [10] [61]
unavoidable, can inflict Defence Down
(Painful Beat/45, Lobster Slayer/50)

Grand Slam
[-] [8] [74]
hits all enemies, unavoidable, delayed
(Head Splitter/48)

Time & Tide
[Feint - Focus - Beat - Beat] [14] [77]
unavoidable, can deathblow
(Painful Beat/53, Roll Beat/55)

/HA/

Gale Strike
[Tree - Swing - Swing - Swing] [7] [74]


All but Grand Slam can be sparked off Buffalo/Armor Bugs in VogCanyon.
Grand Slam can be sparked off Megalith Beast.

======================================================
AH YES THE SPELLS, I AM NOT BUTCHERING THE OG NAMES
======================================================

==========================================================================
ADDITIONAL MENTION, COMBOES WITH + IN THEM CANNOT SPARK DURING DUEL
(they can still be learned post-duel).

i.e:
You can pick Rich, duel Anima Ghoul (in Laubtower), use Tone once then kill the ghoul with bear crush and post duel Soul Hymn can be "learned".

It will probably take some time, as learning spells this way is more tiresome than simple sparking (since you have only 1 chance per battle - during the post battle rewards), so I would suggest either doing it in party battles (esp. since you can do multiple characters at once); just check again for who can actually learn the spell; unlike weapon arts spells can be only learned by specific characters (I wrote everyone who can acquire the spells), or to get some good weapon arts so you can use anima + 3 command to oneshot monster.
example:


==========================================================================
TREE
Needle Shot
[Tree - Stone] [4] [36]

Life Water
[Tree - Water] [5] [30]
Recover HP, recover K.O

Woodstock
[Tree - Beast] [5] [32]
bonus damage vs Plants

Sleep
[Tree - Tree - Flame] [5] [-]
target AoE, can inflict Sleep

//FOLLOWING SPELLS cannot be sparked during duel, but can be learnt post-duel
Bushfire
[Tree + Flame] [6] [28]
Large circle area
(Narcisse starts with it)

Song of Earth
[Tree + Tone] [8] [-]
hits all enemies, can inflict Fear/Confusion
(Labelle: Tone/36, Cordelia: Tree/36;Tone/38, Julia: Tree/36, Raymond: Tone/40, Sargon: Tree/40, Rich: Tone/40, Gustaf: Tone/40)

STONE
Delta Petra
[Stone - Tree] [6] [50]
cone AoE, can inflict Petrify

Magmaxplosion
[Stone - Flame] [5] [38]
target AoE

Water Hammer
[Stone - Water] [5] [20]
can inflict Fear, additional hit will turn to Confusion

Guard Beast
[Stone - Stone - Beast] [9] [-]
one ally, ~25% chance to negate damage

Stone Armor
[Stone - Stone - Stone] [4] [-]
one ally, Defence Up

FLAME
Recovery Breath
[Flame - Tree] [4] [-]
one ally, remove abnormal status effect

Flame Naga
[Flame - Beast] [5] [40]
target AoE, bonus damage vs Frogs

Incineration
[Flame - Flame - Tree - Stone] [10] [75]
can inflict deathblow

//FOLLOWING SPELLS cannot be sparked during duel, but can be learnt post-duel
Firestorm
[Flame + Tree] [8] [66]
hits all enemies
(Kelvin: Tree/28, Wil: Tree/34;Flame/33) rest irrelevant, comes from Wil vs Egg

Soul Hymn
[Flame + Beast + Tone] [16] [-]
all allies, Regen, Morale Up
(Remake: apparently Eleanor: Flame/?? (feels about 35-ish) can spark off Land Urchin, Kelvin: Flame/43, Ventarbre: Tone/43, Rich: Tone/46], Gustaf: Flame/42;Tone/44)
!CAN BE SPARKED OFF ANIMA GHOUL BY BOTH KELVIN AND RICH!
ALL HAIL SOUL HYMN

WATER
Aqua Viper
[Water - Beast] [4] [18]
line AoE, bonus damage vs Frogs

Call Thunder
[Water - Water - Tone] [7] [60]

Permanence
[Water - Water - Stone - Tree] [8] [-]
one ally, prevents status change

Heavenly Thunder
[Water - Water - Tone - Tree] [9] [70]

//FOLLOWING SPELL cannot be sparked or used during duel, but can be learnt post-duel
Sonic Poison
[Water + Tone] [5] [44]
hits all enemies, can inflict Poison
(Cordelia: Water/20;Tone/24, Wil: Tone/23, Venta: Water/21;Tone/22, Julia: Water/24, Sargon: Tone/23, Rich: Tone/23)

TONE
Spoil Wave
[Tone + Water] [3] [-]
line AoE, can inflict Psyche down

Sonic Sanctuary
[Tone - Stone] [4] [-]
one ally, Magic Up (magic defence up)

Hymnal
[Tone - Tree - Beast] [11] [60]
hits all enemies, bonus damage vs Undead

Stone Memory
[Tone - Tone - Stone] [7] [-]
can inflict Petrify
(Narcisse: Tone/35, Kelvin: Tone/33, Cordi: Stone/35;Tone/33, Venta: Tone/35, Raymond: Tone/36, Sargon: Tone/35, Rich: Tone/36, Gustaf: Tone/34) (can be sparked in duel now)

//FOLLOWING SPELLS cannot be sparked during duel, but can be learnt post-duel
Sonic Burner
[Tone + Flame] [6] [21]
cone AoE
(Venta: Tone/17, Eleanor: Flame/13, Sargon: Tone/16, Gustaf: Tone/15, Roberto: Tone/15;Flame/15, Cordy: flame/tone 16)


BEAST
Berserk
[Beast - Beast - Beast] [3] [-]
one ally Berserk, Morale Up

Regenerate
[Beast - Beast] [3] [-]
one ally, regen

Reviva
[Beast - Flame - Flame - Beast] [9] [-]
one ally, revive once

//FOLLOWING SPELLS cannot be sparked during duel, but can be learnt post-duel
Mindscape
[Beast + Tree] [3] [-]
all allies, Quick Up
(Kelvin: Tree/12, Tyler: Tree/17, Wil: Beast/15, Rich: Beast/13, Raymond: Tree/12;Beast/10, Gustaf: Beast/13, Meythia: Beast/12, Ginny: Beast/12)

Howling Heaven
[Beast + Tone] [5] [32]
hits all enemies, can inflict Morale down
(Kelvin: Beast/18 !OFF GREMLIN!, Venta: Beast/22, Julia: Tone/23, Rich: Beast/23, Gustaf: Tone/21;Beast/21, Meythia: Beast/24, Roberto: Tone/25;Beast/25

My long road:
Spending a lot of time in RoHN (most of it in skelly room) can net you something like this:


Unsparked after [Wil's Departure]:
//Refused to spark:
Dragon Revolution/Triple Dragon
-> Was sparked on Megalith Beast by Cordy right after [Tycoon Wil] (1 try)
Grand Slam
-> Was sparked by Labelle (!) during same battle with Megalith Beast
Multi-Way/Doppelgangers
-> Was sparked by Gustave on Armored Beetle in VogCan, after [Mother's Sickbed] (took around 10 minutes)
// Character restricted:
Howling Heaven
-> Was sparked by Kelvin via Gremlin party battle, first scenario he was available
Soul Hymn
-> Was sparked by Kelvin, after [Mother's Sickbed] and [Tycoon WIl] (via Laub Tower Anima Ghoul)
Tornado Blade
-> Comes with Johan

Which left me with (138/140) by [Anima Faith Fiasco].
unsparked Eradication (Gustave wailed over two hours with both HB and CC over Megalith beast to no avail, then Raymond done the same without any result. IG still not possible) and story gated Tornado blade
-> Eradication was sparked later off Queen peg during [Wil vs Egg], party battle, Heartbreaker, with Raymond.

140/140 By the [Into the Forest].

The game was basically in autopilot mode since here, since I had ~20k chips in circulation and all custom orders unlocked. So, basically a save file if you just want to cruise through non-ng+.
Maybe I missed my Eradication spark on Ant Commander during Laub tower quest, but you really want Gustave for it, and without Cinderforge its uhhh. I will try it next time :>

Short how-to:
--->Start with [Wil's Departure]
Do not grab any of the Quells until you are finished so you can rest in Westia's inn.
Spend crowns on accessories early and weapons after farming.
Initial Spells/Arts prio was:
Incineration (via land urchin duel) -> Delta petra -> Firestorm (post battle, via blue skelly, a few loads were neeeded) -> some CR farm via ghouls + firestorm -> getting rest of anima accessories -> Reaper+hybrid arts -> party farm Blue skellies for post-battle sparks + stone plates -> Duel on skellies for whatever was left.
> Good idea would be also spark some arts by giving Tyler and Cordy swords/staffs/whatever, placing them as 1st and 2nd and cleaning with 1-2 firestorms after. You'll raise weapon levels for inheriting and for custom orders.
>Finish once you have what you want/need.

>>IF you want Laub as Wil play first play up to but do not finish [Mother's Sickbed] then go for [Tycoon Wil]
>>IF you want Laub as Gustave then first finish [Tycoon Wil] then go for [Mother's Sickbed]

Gustave Path:
---> Proceed with Wil until you finish [Tycoon Wil]
--->Play through with Gustave (inherit Wil party so you are overpowered),
> MAKE SURE you have spare beast accessory so you can give it to Kelvin.
> Learn Howling Heaven with Kelvin off Gremlin.
> Don't bother trying to learn complicated sword arts.
> Train/get whatever you missed/need (like Multiway) in VogCan before going to Laubholz.
> Now as for Laub tower. Fighting Lich with Gustave's party will be super tough, if you go for it make sure you have at least stone plate x3, preferrably one being Blackstone armor instead and 3x Deadstone.
> Try for Eradication or any other difficult spark on Ant Commander during Lich summon sequence.
> Kill Lich so you dont miss on CF (you can actually skip Lich if he is too challenging and fight him after [Anima Faith Fiasco].. if you are a coward, that is :P)
> Qsave in Ghoul room
> Slap Cinderforge (or the strongest sword you have) and any flame accesorry on Kelvin and go for Flame -> Charge -> Charge -> Cleave (Bull Crush should be obv. learnt at this point).
> Spend some time loading
> Learn Soul Hymn

Wil Path:
--->Play through with Gustave, but do not clear [Mother's Sickbed]
---> Proceed with Wil until you finish [Tycoon Wil]
> Go slap Megalish beast. Refer to what I sparked above. Load as needed.
> Just clear Laub tower with Labelle or Patrick as usual.
>> Switch to Gustave and clear [Mother's Sickbed]
> Finish learning sword/martials you missed in VogCan
> Go Laub once you are done
> Qsave in Ghoul room
> Slap Cinderforge and any flame accesorry on Kelvin and go for Flame -> Charge -> Charge -> Cleave (Bull Crush should be obv. learnt)
> Spend some time loading
> Learn Soul Hymn

Ta-daaaaa

SaGa Frontier 2 is absolutely great game and I love the fact that it was remastered in a good way.

Hope this aids you in your adventures :)
Feel free to ask any questions, however there is no guarantee of an answer :P

Cheers,