Adding one I don't see mentioned yet, this is for the GBA:
Mega Man Battle Network - Unique and fun battle system: it's part deck-builder, part action rpg. The world and exploration are fun, with varied dungeon design. The series is quite long and expands into the DS, but the first 2 are my favorites.
https://archive.org/details/scary-maze-gamewinterrowd
I remember playing this back in the day. I just replayed it, and even though I knew exactly where it was going to pop up, it still startled the s*** out of me, lol.