What's the best Nintendo handheld franchise?

Wow. This is pretty sad in my opinion. Zelda seriously is the best one!

@Nanotech43 I agree totally

@Nanotech43 keep in mind that this is for HANDHELD franchises, so the console games don't count. Also I'm not bashing Zelda, I love it too, I just think it doesn't have the best handheld games.

that's a good point, my question is especially meant to be about the handhelds, totally excluding excellent Pokemon, Zelda, and Mario Cart console games

Zelda