One of each kind, maybe two or three... I kinda juggle my roster depending on what I'm up against, but the tradeoff's that I've got way too many Pokémon and not enough time to spend with them one on one.

But you're on the right track. Honestly, team building's one of those things that can be as simple or as complicated as you need it to be. I mean, once you start going into types, that's when it gets starts getting crazy. Maybe part of the reason that so many Gym Leaders stick to one type is to keep things basic.