Which you plan to play on (PC, Android, iOS, or Mac)? Your preferred emulator ? If you need help finding the correct base ROM version ?
Find a clean, unedited ROM of the required base game (usually Pokémon Emerald (U)(Trashman) or Pokémon FireRed (1.0) ). You must source this file independently from your own legally owned backups. pokemon mogul platinum gba download