"1636 Pokémon Fire Red (U)(Squirrels)" is the industry-standard v1.0 ROM dump of Pokémon FireRed
Acquire the Base: You must have the original 1636 Fire Red Squirrels ROM file. 1636 Pokemon Fire Red Squirrels
Composition: Split the screen diagonally. One side shows the classic Squirtle 1636 Pokemon Fire Red Squirrels
: Most modern hacks only work with the 1.0 version (Squirrels). The 1.1 version of 1636 Pokemon Fire Red Squirrels