Setting up an Ultralocke requires modifying the game files. Note that downloading copyrighted ROMs is illegal; you should use a copy of the game you already own.

Often caused by an outdated version of the game. Ensure you have the v1.2 Update installed in Citra.

There is no single "Ultralocke" file available for public download because it was a created specifically for the YouTuber Austin John Plays and his collaborator PhillyBeatzU.