Bypass the App Store (At Your Own Risk) Without Jailbreaking
Apple is notorious for locking down app distribution, and there are a lot of good reasons for doing so. It can provide security to end-users and ensure high-quality apps; but, it can also mean certain apps—such as game emulators—aren’t allowed.
One way to get around this is by sideloading apps. In the past you’d need to jailbreak your device or install an IPA using a developer account and a computer. But now, AltStore and AltServer make it possible to easily add apps from other sources. One of these apps is Delta, a game emulator that supports Nintendo, Super Nintendo, Game Boy, GBC, GBA, and Nintendo 64 game files.
You should always be careful when using apps that aren’t Apple-approved, but if you feel comfortable, you can learn more about AltStore here.