Whats a good online 3ds game i can play with my friend

It's probably just me but when I try to play online I get stuck on the screen where it says ″searching for player″

High Score in 2-P Run (Distance (Short))!

High Score in Advanced Step (Beginner)!

High Score in Rhythm Boxing (Beginner (3 mins.))!

High Score in Trampoline Target!

I just got to the elite four :D

What good online 3DS games for me and my friend to play

I need to complete two more

I can't find a lobby with it filled i will just find 1 person but not 2