0x08023C20: 4770 bx lr (returns)
1. Objective To modify the game code of Pokémon Fire Red (USA, Rev 1) so that any experience points (EXP) earned after a battle are automatically doubled before being added to a Pokémon’s total EXP. pokemon fire red exp multiplier x2
At the end of the EXP calculation, before the function returns, we insert a left-shift (multiplication by 2) of the value in r0 . 0x08023C20: 4770 bx lr (returns) 1
We overwrite a few preceding bytes to add lsl r0, r0, #1 (logical shift left by 1 = multiply by 2), then return. before the function returns
Original bytes: 00 00 47 70 Patch to: 40 00 47 70
00 00 47 70 to: