Suikoden 1 and 2 (and 3-5 + tactics, but they aren't as rare), Valkyrie Profile 1 and 2, Steambot Chronicles, and Robot Alchemic Drive are the ones I know I have off the top of my head. I mainly keep the rare ones that I actually play or played in the past though; I've never been a big fan of keeping new games and letting them gather dust though I can understand the appeal.
Suikoden 1 and 2 (and 3-5 + tactics, but they aren't as rare), Valkyrie Profile 1 and 2, Steambot Chronicles, and Robot Alchemic Drive are the ones I know I have off the top of my head. I mainly keep the rare ones that I actually play or played in the past though; I've never been a big fan of keeping new games and letting them gather dust though I can understand the appeal.