Let me try and think about what I have
Red (x3 - 2 GB cartridges and VC)
Blue (x2 - GB and VC)
Yellow (x2 - GB and VC)
Green
Ruby (?)
Emerald
LeafGreen
Platinum
HeartGold
White
Black 2
White 2
X (x2 - regular and for hacks)
Y (x2 - regular and for hacks)
Omega Ruby (x2 - regular and for hacks)
Alpha Sapphire (x2 - regular and for hacks)
Colosseum
XD: Gale of Darkness
Pokemon Battle Revolution (x2 - one doesn't work tho)
Stadium
Stadium 2
Snap
Super Mystery Dungeon
Mystery Dungeon: Gates to Infinity
Mystery Dungeon: Red Rescue Team
Pokemon Conquest
Pokemon Art Academy
I did have Diamond, Pearl, either Gold or Silver (idr), Sapphire, one of the Ranger games and Pokemon Dash at one point, but I'm not sure what happened to them. I remember losing Gold/Silver as a kid and being devastated.