I installed Ignited via SideStore. No Jailbreaking necessary. Not computer tether. SideStore can renew the side loaded emulator every 7 days when on WiFi. The iPhone is perfect for DS emulation with a stylus.
(Ignited is a fork of Delta with more options, and SideStore is a fork of AltStore, with no computer tether needed)
Can you do that on Android?
yes, but it’s unfortunately much less exciting, because it’s very easy and just works.
Best Android app for emulating DS in my experience is DraStic.
Can confirm. I played so many games on DRaStic over the last few years. Zero issues.
Of course, some games are not well suited to a full touch screen, especially if they require quick coordination of both stylus and D-Pad. They are relatively few though - most games work great.