Right of the bat I would recommend the entire Castlevania trilogy of games, mainly because I just went all three of them 
But there are tons of great games for the DS: Dragon Quest IV and Dragon Quest V, Mario&Luigi: Partners in Time and Mario&Luigi: Bowser's Inside Story, Megaman ZX, Megaman ZX advent, Metroid Prime Hunters, The World Ends With You, Ace Attorney: Miles Edgeworth, Phoenix Wright, Hotel Dusk, Kirby: Canvas Curse, Kirby: Ultra Superstar Saga, Final Fantasy III and Final Fantasy IV, Avalon's Code, Phantasy Star Zero, New Super Mario Bros, Mario Kart DS, Pokemon Heart Gold/Soul Silver, Kingdom Hearts 358/2 Days, Legend of Zelda: Phantom Hourglass and Legend of Zelda: The Spirit Tracks, Lunar Knights, Trauma Center: Under the Knife.
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
