@exelotl
Cool! I never had sonic advance when I was younger, but looking at it now, the visuals are really clean. Like this city background with the hdma effect.

Level has a nice yellow-orange/ultramarine theme going:

Cool! I played battle network a lot when I was younger, but haven’t tried chip challenge yet.
Last year I played kuru kuru kururin for the first time, lots of fun, although late in the game it gets more frustrating than fun and I didn’t finish it. Recommended though.
I also started playing Mother 3 and was amazed by the attention to detail and quality of the animations, the writing is also well done. The battle system holds the game back a bit, but still a good experience overall.
I tried Minish Cap a couple months ago but couldn’t really get into it. Something about the color palette and map design bugged me. The colors are hyper saturated and have no cohesion, the animations are a bit too silly, the game feels like it just lacks soul compared to Link's Awakening or Wind Waker. Just my opinion, a lot of people would disagree.
I guess I’d say my favorite is Advance Wars 2