While you won't find Yuzu, Apple recently relaxed its rules, allowing several high-quality retro emulators onto the official App Store:

The claim was impossible: a functional, native port of the emulator for iPhones. No cloud streaming, no jailbreak required. Just a signed .ipa file ready to be sideloaded.

Be extremely cautious of any websites or YouTube videos claiming to provide a "Yuzu IPA" for iPhone or iPad. These are typically and may contain malware designed to steal personal data. Why Yuzu isn't on iOS