Emulation on iOS is awesome! Everyone on this subreddit should try it out. Three apps recommended for iOS emulation are Delta Emulator, DolphiniOS, and Provenance Emulator. You have to sideload these apps
Dolphin Emulator: What you should know about GameCube and Wii emulation!
DolphiniOS 2.2.1 : l'émulateur de Wii et Gamecube sur iPhone et iPad - iPhone Soft