Did not see mentioned:
- Densetsu no Stafy 1-3 (Good underwater platformer series from Tose/Nintendo. Japan only but being a platformer it's fine to play without knowing Japanese.
https://en.wikipedia.org/wiki/The_Legendary_Starfy )
- Klonoa (series) (Solid puzzle platformer series from Namco, includes Klonoa: Empire of Dreams, Klonoa 2: Dream Champ Tournament, Klonoa Heroes: Densetsu no Star Medal (JP only)
https://en.wikipedia.org/wiki/Klonoa )
- Magical Vacation (Solid Japan only Nintendo RPG, English translation patch available)
- Tomato Adventure (Solid Japan only Nintendo RPG, English translation patch available)
- Hamtaro: Ham-Ham Heartbreak (Solid adventure game from Nintendo)
- Puyo Pop (Solid version of classic Puyo Puyo)
- Love Hina Advance (Visual novel/dating sim with English translation patch)
- Koro Koro Puzzle Happy Panechu (tilt sensor puzzle game from Nintendo, tilt patch available
https://gbatemp.net/threads/gba-no-tilt-patches-for-ds-users.584128/ )
Also +1 on the following:
- Guru Logic Champ
- Hamtaro: Rainbow Rescue
- Harvest Moon: Friends of Mineral Town (one of the best entries in the entire series)
- Kuru Kuru Kururin/Kururin Paradise
- Mother 1+2
- Mr. Driller (series) (though Mr Driller Ace really is much better)
- Pokemon Pinball: Ruby & Sapphire (especially with the new rumble patches)
- Sword of Mana