* Shaymin: It can be found in Pokémon Diamond and Pearl, but only in its Land Forme. Its Sky Forme can be obtained through a special event in those games.
* Darkrai: It can be obtained in Pokémon Platinum through a special event or by trading with someone who has it. It's not available in Pokémon Pearl.
* Arceus: It can be obtained in Pokémon Platinum through a special event or by trading with someone who has it. It's not available in Pokémon Pearl.
To get these Pokémon, you'll need to:
* Trade: Find someone who has them in other games and trade for them.
* Utilize Event Distributions: If there are any events being held, you might be able to obtain these Pokémon through those events.
* Use a GameShark or Action Replay: These devices allow you to cheat and add Pokémon to your game, but this is considered cheating and may not be allowed in online play.
It's important to note that Nintendo rarely re-releases event Pokémon, so obtaining them will likely require trading or finding someone who has them from an older event.