What are the best touchscreen heavy games on DS and 3DS.

So I am going down a nostalgia fueled trip on my 3DS. I was playing Trauma Center and I LOVE that series back in the day. So I was wondering what are the best DS and 3DS games that use the stylus a lot? I feel like some games are perfect for the stylus and are pretty unique, even if a tad gimmicky. Anything come to mind?