Pichu, Pikachu, Raichu (should've seen that comin), Riolu, Lucario, Chimchar, Monferno, and Infernape
I like your thinking 'Pikachu Boy', I forgot there were other Pokemon in the Sinnoh Pokedex. I have too many favourites, Empoleon, Staraptor, Buizel, Dialga, Azelf.
It's a tie between Buizel, Dialga and Arceus.
Kricketune! And yanmega :3
But Krickegtot, Cherubi, Finneon, Mantyke, Burmy, Budew, Piplup, Turtwig, and Chingling are swish too.
Really I like all Sinnoh Pokémon.
Except the Chimchar line which must die.