What's your favorite TCG card of your favorite Pokémon? =)
I'm going to be really boring and say Base Set Charizard. I never was able to get one as a kid/teenager so when I got it I appreciated it all the more.
So personally I'd say it's not really a boring choice in that sense.
Definitely this XY Celebi promo card. I love that its Ability is a reference to the movie.
Spoiler:
I used to have the Illustrator card