Mario & Luigi Superstar Saga (Superb game, best in the series next to Bowser's Inside Story)
Kirby & The Amazing Mirror (Closest we'll probably get to a Metroidvania type Kirby game)
Warioware Twisted (The gyroscope controls actually add to the game and don't feel like a gimmick)
Super Mario Advance 4 (Great port of the All-Stars version of SMB3, the bonus e-reader levels easily make it the definitive version)
Megaman Battle Network 3 (My first game to the series and personal favorite, great game)
Golden Sun (Bretty gud rpg)
The Legend of Zelda A Link to the Past (Great port of the snes game and happens to have four swords too)
Mario Tennis: Power Tour (Actually has more content than the last two Mario Tennis games released by Nintendo which is really sad honestly)
Pokemon LG/FR/R/S/E (It's Pokemon)