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You're looking for a post related to Pokémon Fire Red, specifically a US version, and a mention of Squirrels in a GBA ROM exclusive. Here are a few possible posts:
"Check out this awesome custom ROM for Pokémon Fire Red (US version) that includes Squirrels as a Pokémon! The ROM is exclusive to GBA and features a ton of new content, including Squirrels as a playable Pokémon. Has anyone else tried this ROM? What do you think of the new features?" 1635 pokemon fire red usquirrelsgba rom exclusive
"Hey gamers! I'm playing Pokémon Fire Red (US version) on my GBA, and I was wondering if there's a way to encounter Squirrels in the game. I know it's not an official part of the game, but I've heard rumors of ROM hacks that include Squirrels as a Pokémon. Has anyone tried a ROM hack with Squirrels in Pokémon Fire Red?" You're looking for a post related to Pokémon