I heard about that game. I hear it has a similar vibe to SMT Devil Survivor, which is one of my favorite DS games.The World Ends with You.
This is the best RPG I've ever played till the end. Its storyline and character development are also comparable to top visual novels.
You forgot the BEST one´s forIf you have gba emulator...
Summon night 1 and 2
golden sun
breath of fire series
sonic battle
megaman battle network series 1~6
final fantasy series
medabot series
pokemon Fr/Lg and RSE
Tales of phantasia
Zelda series
Fire emblem
PSP emulator
Valkyrie Profile
Tales of... series
Lunar
Dragon 2020th series(english patche 99.9% both)
Castlevania series
Fate series
Final fantasy series again
Breath of fire again
SNES emulator if it exist
super mario RPG
legend of mana series
surely this games will never ask for any internet/ WIFI connections and no ads as well