The first Mystery Dungeon game I got is Darkness.
Really wanted to play as Pikachu, so I kept at the quiz to get her the first time. Got Bulbasaur as partner. Failed to get pass the boss of the storyline numerous times with this combo, so I started over.
Got Pikachu and Chimchar my second go around and love this combo except, I failed recently and am in need of a rescuing :'(.