Mario Kart - racing
Animal Crossing Wild World - cartoon/life-sim
Advance Wars Dual Strike - turn based, grid battle, manga style, rpg
Advance Wars Dark Conflict - same as above
Final Fantasy Tactics Advance 2 - turn based, manga style, isometric grid battle, rpg
Final Fantasy XII Revenant Wings - rts, monster battles, anime style, rpg
Phoenix Wright Ace Attorney - point and click, anime style, clue searching, rpg
Izuna the legend of the ninja - roguelike, dungeon crawler, rpg, anime style
Megaman ZX - platformer, anime style, rpg
Luminuos Arc - isometric battle grid, anime style, rpg, fanservice
The World Ends With You - rts, unique battle system, anime style, rpg
Dragon Quest Monster: Joker - 3d adventure, rpg, anime style, monster catching
Harvest Moon DS - life-sim, rpg, anime style
Custom Robo Arena - battle arena, customization, rpg, anime style
Hotel Dusk Room 215 - point and click, detective style, rpg, cartoon style
The Legend of Zelda: Phantom Hourglass - 3d adventure, rpg, cel shade, anime style
Castlevania: Portrait of Ruin - horror, platformer, rpg, anime style
Starfox Command - dogfights, strategy, rpg, anime style
Puzzle Quest - puzzle, anime style, quests, rpg
I remember the Gameboy Color the most, I loved playing Pokemon Gold.