The My Little Pony: Friendship is Magic Squaroes hold up to 100 standard- or Japanese-sized trading cards (from games like Magic: The Gathering, Pokmon, Lorcana, Flesh and Blood, Yu-Gi-Oh!, Riftbound, and One Piece) in double protective sleeves*
Whether you obtain the prerequisite card from packs or crafting makes no difference, the relevant part is that you actually have it on hand
Non-serialized historical figures are mechanically identical to serialized variants
Some observations and ideas: - The AI seems unable to use Energy Spike effectively, which is a move from Electrode GB that allows you to search for a basic energy in your deck and put it on one of your Pokmon
There is also a tactile joy in building
Assuming that this does work as suspected, this also means that Rukarumel, Biologist will work