Looool. Not sure if you are trolling or what, but 'Garachamp bb' belongs to Gen IV and of course made its debut on that same generation, thus Garchomp's a Gen IV Pokémon even though it is part of the Kalos Pokédex/receiving a Mega Evolution.
I'm a greedy one, I love pretty much everything. Except Slurpuff and its evolutionary family. Aromatisse wasn't part of the fav, but she slowly grew on me when I used one during my first Pokémon Y run.