DS: Super Robot Tasien Og Saga Endless Frontier: I love this game. Nobody has even ever heard of it, but it is my all time favorite RPG. I can't believe people think people only like it for it's "fanbase", personally, I was uneffected by the fanbase and actually love it for the gameplay, replayability, story, and content.
GC: MegaMan Battle Network Trasmission I just like this game because I loved the MMBN series.
GBA: Pokemon Crystal, yes, underrated. Everyone's all, silver and gold all the way! Personally, crystal had everything the previous games had with much more.