This was straight up my literal childhood, I never got to play the "big" games and mostly played very cheap and obscure games. Despite that there was so many different games I played and I loved it.
My favourite DS games are: Kirby Super Star Ultra Super Mario 64 DS Sonic Rush Mario and Luigi: Bowser's Inside Story Professor Layton and the Diabolical Box (also Unwound Future)
Luna Knights! I never hear anyone talk about game. that was my childhood. Also, if anyone reading this hasn't tried Monster Tale. YOU. MUST. PLAY. IT. NOW! another hidden game no one ever talks about.