For context, its sister game, Pokémon LeafGreen , was cataloged under scene number .
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FireRed Squirrel Nuzlocke
If you download a popular Pokémon fan game or ROM hack, the creator almost always specifies that you must patch their file onto a "1636 FireRed (Squirrels)" base.
. It is the standard base ROM required for patching most popular Pokemon ROM hacks, such as Pokemon Unbound Radical Red Why this version is used Compatibility : Most major ROM hacks are built specifically for the 1.0 (Squirrels) 1636 Pokemon Fire Red Squirrels
| ROM Hack | Type/Key Features | Requires 1636 Fire Red (U)(Squirrels) | | :--- | :--- | :--- | | | Difficulty hack with modern mechanics. | ✔️ Yes | | Pokémon Unbound | A massive, original story hack. | ✔️ Yes | | Pokémon GS Chronicles | Johto region hack. | ✔️ Yes | | Pokémon Odyssey | Complete hack (v4.1.1). | ✔️ Yes | | Pokémon Xenon | New region GBA hack. | ✔️ Yes | | Pokémon Re: Universe | Extensive feature hack. | ✔️ Yes | | Touhou Puppet Play Enhanced | Touhou character hack. | ✔️ Yes |
The number isn’t random. In the original Japanese Fire Red build, 1636 was intended as the Pokédex index range for “regional small mammal” clones (after Rattata and Sentret). But the squirrel trio was cut due to memory limitations on the 256KB save file — and because, according to an alleged internal memo from Game Freak (never confirmed), the devs felt three Normal-type rodents per generation was “one too many.” For context, its sister game, Pokémon LeafGreen ,
If you have downloaded a patch for a custom Pokémon game, you will need to combine it with your clean 1636 FireRed file.