Kaito, Dancing Shadow Planeswalkers will almost always be bomb plays in Limited and worth considering for Constructed
Mimikyu is a Fairy Pokemon
Fan Art and Character Cards Pokmon fans who draw fan art, design original creatures, or create custom characters have no mainstream way to get those characters printed as real cards
Interestingly enough, in the most recent Banned and Restricted announcement from Wizards, they mentioned that they were looking at potentially taking action against Knight-Errant of Eos - which would have been an extreme blow to that deck given the ability of that card to refill your hand with more threats
My personal favorite battle, Invasion of Ikoria, offers a flexible ability on the front that scales at different points of the game, and then sets up an outright win on the back with a giant creature that features a unique ability of its own to push through massive damage against your opponent