Let's see...
Pokemon Blue, Pokemon Stadium, Pokemon Snap, Pokemon Colosseum, Pokemon XD: Gale of Darkness, Pokemon Sapphire, Pokemon Diamond, Pokemon Platinum, Pokemon White, Pokemon HeartGold, Pokemon X, Pokemon Ranger, The Pokedex 3D app if that should count and I'm not counting Silver, FireRed, Pearl, SoulSilver, and Black but let's say they are under the same roof.