cynthia's garchomp pokemon card Pokémon TCG: ex Premium Collection ex has been Knocked Out Pokemon Cynthia's Garchomp Ex Premium

In terms of actual releases, the Pikachu Illustrator card, with only 39 to 41 copies, is the rarest

That makes it pretty decent in the right shell looking at Kalamax in particular

Because the new Ditto's Sudden Transformation ability allows TCG players to use any move from basic Pokmon that are in their discard pile, crafty players can purposely load up their discard pile with Mad Party Pokmon

Geth, Lord of the Vault + Chainer, Dementia Master Reanimating creatures from your opponents graveyards is cool, but Geth, Lord of the Vault and Chainer, Dementia Master have such high casting and activated ability costs

Its also periodically back-breaking against red and/or black decks, though thats mostly bonus text