RetroArch

Description
RetroArch can play any emulator for iOS! Nintendo, Sega, Sony, Arcade. RetroArch has it all.

install AltStore on your iOS device. To learn how, watch this video.
Download the latest RetroArch IPA file.
Open the AltStore app on your device and go to the "My Apps" tab.
Tap on the plus "+" icon in the top, then browse and select the RetroArch .ipa file that you downloaded.
If it's your first time using AltStore, you will be asked to enter your Apple ID and password. AltStore requires it for signing the app so it can be installed. We recommend you use a burner account.
The app will begin to install and once completed, you can open it from your Home screen.

Download the latest version of Sideloadly for Windows or macOS and install it on your PC.
Download the Misaka Package/Tweak Manager IPA file from this page and save it to your computer.
Connect your iOS device to your computer using a USB cable.
Open the Sideloadly app on your PC.
You may be prompted to install the Mail Plug-in. Click the "Yes" button to continue.
Enter your Apple ID email under the "Apple account" field.
Drag and drop the Misaka Package/Tweak Manager .ipa file into the IPA field shown on the left side of the interface. The field is represented by an IPA image.
Click the "Start" button to begin the sideloading and installing the IPA.
When prompted, enter your Apple ID password. The tool uses your Apple ID to sideload the app. We recommend you use a burner account.
Sideloadly will begin installing Misaka Package/Tweak Manager on your iOS device.
Once the app is installed, don't open it yet. You first need to verify your Apple ID profile if it's your first time using Sideloadly. To do it, go to Settings > General > Device Management. Tap on your Apple ID and press the Trust button. Tap on Trust again from the popup alert.
Now go to the Home screen to open the installed app.