Here's why:
* Action Replay DS is a cheat device: It allows you to modify game data, not download or install new games.
* Pokémon Platinum is a separate game cartridge: You can't transfer it onto another device using an Action Replay.
To play Pokémon Platinum, you would need to purchase the game cartridge separately and insert it into your DS.
Here are some ways you can get Pokémon Platinum:
* Buy a used cartridge: You can often find them online or at video game stores.
* Buy a digital copy: Some online stores may offer digital copies of older DS games, though this is less common than physical copies.
* Emulate the game: You can play Pokémon Platinum on a computer or other device using an emulator. However, this is considered piracy if you don't own the original game.
Remember to only obtain games through legitimate sources to support the developers and avoid potential legal issues.