Likely a typo for “U.S.” or a scene release tag for “USA – unreleased beta.” Or just a formatting error: “U--” instead of “(U)”.
Did we miss a detail about the 1636 code or squirrel Pokémon? Share your findings in the comments below. And remember: always patch legally from a clean ROM you own. 1636 Pokemon Fire Red - U-- Squirrels
Better to use the standard modifier:
It could be a or glitch Pokémon index. In glitch-heavy ROMs, values above 0xFFFF sometimes appear. But that’s unlikely. 1.3 Cheat Code: Walk Through Walls or Item Modifier An Action Replay code like “1636” could be an incomplete item modifier. For example, in Fire Red (U) , the code for Rare Candy in slot 1 of PC is often: Likely a typo for “U
If you’re looking to relive Kanto with bushy-tailed rodents and acorn mechanics, that hack is your holy grail. Otherwise, stick to the original Fire Red — but don’t be surprised if a glitched Rattata sometimes looks suspiciously like a squirrel. And remember: always patch legally from a clean ROM you own