I should not be allowed to have this power eheehehehehehe ;D

All/Anyone
Zombie, skeleton, ghost, pre-evo or evolution, animal/mythical creature, Legend Pokemon(if not), non-Legend Pokemon (if Legend), related Pokemon (ie Naya>Vaporeon or Talon>Seviper), each other, Mewtwo

Naya
Manticore, Roario (Viva Pinata), Sanctuary Guardian (Dark Souls)

Talon
Wolverine (X-Men), Asylum Demon (Dark Souls), War (Darksiders)

Mist
Witch (master of originality right here ;D), Priscilla (Dark Souls), Alduin (Skyrim)

Isthmus
Hydrus (Shadow of the Colossus), Hydra (Dark Souls)

Pudgey
Avion (Shadow of the Colossus)

Alvira
Elsa (Frozen), Sif (Dark Souls), Snow Wing Breeze (Crimson Dragon)

Entei
Ruin (Darksiders), Cenobia (Shadow of the Colossus)

Raikou
Celosia (Shadow of the Colossus)

Ho-oh
Hellkite Wyvern (Dark Souls), Odahviing (Skyrim)

I may or may not add more later >:D