In Sapphire and Emerald, I chose Treeko and Torchic, respectively. Mudkip is too overrated.
In Crystal and Silver, I chose Tododile. He was a cute, little partner. Well, until he evolved. XD
Hm.... if I have D/P/P, I would've gone with Chimchar.
Red, Firered, and Leafgreen was all Bubasaur, Charmander, and Squirtle, respectevly.