The following Game.ini code will have the little fire, lightning, and poison wyvern spawning alongside the normal wyverns at both locations on Ragnarok.

I'm unsure if they naturally lay eggs yet, however our server uses immersive taming anyways.

ConfigAddNPCSpawnEntriesContainer=(NPCSpawnEntriesContainerClassString="SE_DinoSpawnEntriesWyvern_C",NPCSpawnEntries=((AnEntryName="LittleFireWyvern",EntryWeight=0.5,NPCsToSpawnStrings=("Wyvern_Character_BP_LittleFire_C")),(AnEntryName="LittleLightningWyvern",EntryWeight=0.5,NPCsToSpawnStrings=("Wyvern_Character_BP_LittleLightning_C")),(AnEntryName="LittlePoisonWyvern",EntryWeight=0.5,NPCsToSpawnStrings=("Wyvern_Character_BP_LittlePoison_C"))),NPCSpawnLimits=((NPCClassString="Wyvern_Character_BP_LittleFire_C",MaxPercentageOfDesiredNumToAllow=0.05),(NPCClassString="Wyvern_Character_BP_LittleLightning_C",MaxPercentageOfDesiredNumToAllow=0.05),(NPCClassString="Wyvern_Character_BP_LittlePoison_C",MaxPercentageOfDesiredNumToAllow=0.05)))

ConfigAddNPCSpawnEntriesContainer=(NPCSpawnEntriesContainerClassString="SE_DinoSpawnEntriesWyvernTrench_C",NPCSpawnEntries=((AnEntryName="LittleFireWyvern",EntryWeight=0.5,NPCsToSpawnStrings=("Wyvern_Character_BP_LittleFire_C")),(AnEntryName="LittleLightningWyvern",EntryWeight=0.5,NPCsToSpawnStrings=("Wyvern_Character_BP_LittleLightning_C")),(AnEntryName="LittlePoisonWyvern",EntryWeight=0.5,NPCsToSpawnStrings=("Wyvern_Character_BP_LittlePoison_C"))),NPCSpawnLimits=((NPCClassString="Wyvern_Character_BP_LittleFire_C",MaxPercentageOfDesiredNumToAllow=0.05),(NPCClassString="Wyvern_Character_BP_LittleLightning_C",MaxPercentageOfDesiredNumToAllow=0.05),(NPCClassString="Wyvern_Character_BP_LittlePoison_C",MaxPercentageOfDesiredNumToAllow=0.05)))