A clean Pokémon FireRed (U) ROM should generally be named 1635 - Pokemon Fire Red (U).gba . The presence of -squirrels- strongly suggests you are dealing with a patched or modified ROM . Do not assume it is vanilla.
She showed you her arm. Where skin should be, there was the word “-u--squirrels-” in repeating green text. 1635 - Pokemon Fire Red -u--squirrels-.gba Rom-
An entirely new region with modern mechanics. A clean Pokémon FireRed (U) ROM should generally