Since you are playing the "1636 Squirrels" version, standard GameShark and Action Replay codes work perfectly. Note that these codes are different from the original Red/Blue codes; these are specifically for the GBA engine.
How to enter codes: In your emulator, look for "Cheats" > "Cheat List" (or "Add Cheat").
Because distributing the full ROM is illegal, but patches are legal, here is how to create the 1636 Squirrels ROM yourself.
Given its obscurity, why does this keyword have search volume? Three types of users seek this ROM:
A user searching for “1636 Pokemon Fire Red U Squirrels ROM” likely: 1636 pokemon fire red u squirrels rom
Every ROM has a digital fingerprint. The "Squirrels" ROM is unique because it wasn't originally a hack. It was a corrupt dump.
In the early 2000s, the scene group Rising Sun (RS) released a bad dump of Pokemon Fire Red. A bad dump means the data was read incorrectly from the cartridge.
This single line of glitched text spawned the legend. Gamers assumed the game was modded to feature squirrels. In reality, it was a corrupted string of code. The file size was misreported as 16.36 MB (official is 16.00 MB), leading to the "1636" prefix.
By the time the clean ROM was dumped in 2005, the damage was done. The "Squirrels" ROM had become a cult classic—downloaded for its bizarre, unintentional humor. Since you are playing the "1636 Squirrels" version,
In the world of emulation and ROM hacking, this specific version is considered the "Gold Standard."
The "Squirrels" dump is a "clean" or "verified" dump. It has the correct file size (exactly 16,384 KB or 16 MB) and the correct checksum. This means it is a perfect digital replica of the original cartridge.
Because it is a perfect copy, it is the version used by almost every cheat code database and—more importantly—it is the standard base ROM for hacking. If you download a patch for a popular ROM hack (like Pokémon Radical Red, Pokémon Unbound, or Dark Rising), the creator almost always expects you to patch it onto a "1636 Squirrels" ROM. If you use a different version, the hack will likely crash or glitch.
The fascination with this ROM speaks to a broader gaming culture phenomenon: animal replacement mods. This single line of glitched text spawned the legend
There is something inherently subversive about taking a serious JRPG (collecting fire-breathing dragons) and reducing it to suburban rodents. The "Squirrels" ROM is anti-humor. It is absurdist. It asks the question: What if the ultimate champion of the Kanto region was just really good at collecting nuts?
Furthermore, YouTubers like Jrose11 and Pikasprey have featured the "Squirrels" ROM in "Glitch Exhibition" videos, driving search traffic. A 2022 video titled "Can You Beat Pokemon Fire Red if Every Pokemon is a Squirrel?" has over 1.2 million views, directly referencing the 1636 build.
In FireRed, you don't have "Phone Numbers" to rebattle trainers like in Gold/Silver. Instead, you get the VS Seeker.