I commissioned this for the anniversary of the first Pokémon games' debut (Pokémon Day). The idea came from a GIF where Serena from the Pokémon anime turned into a Braixen, and when I couldn't really think of anything good, I settled on "Pokémon as Pokémon Trainers" instead.
I don't consider this to be a transformation piece, but I'll explore that idea someday.