Arceus appears in Pokémon Diamond, Pearl, and Platinum, not Emerald. While it can be caught in these games, it's not considered a cheat.
Here's why:
* Arceus is a legitimate Pokémon: It's a powerful legendary Pokémon that players can obtain through specific methods in its respective games.
* It's not a cheat: It's not a code or exploit that breaks the game's rules.
* Emerald does not have Arceus: Arceus is not available in Pokémon Emerald.
If you're interested in obtaining Arceus in Diamond, Pearl, or Platinum, you'll need to complete specific events and follow the game's instructions.
Please let me know if you have any other questions about Pokémon or specific games. 😊