I'll just cover three of my favorites.
Blaziken has been one of my favorites since before I actually had one. He was half the reason I purchased Sapphire in the first place. I named my torchic Tashiro, after a person from one of my creative works, and our friendship has really taken off since then.
Walrein. Did you know I'm a Beatles fan? Well, now you do. It's a pain to level up a spheal to 44/5, but so worth the effort. He can also be a physical or special attacker, which I enjoy.
Registeel. I once had a friend I called registeel. Now this Pokémon is all I have left of him. It has good defense, something most of my team often lacks. His cry sounds so congested. ^_^