Where do you catch Arceus in Pokemon Deluge?

There is no Pokemon game called "Pokemon Deluge". There may be a fan-made game with that name, but it's not an official Pokemon game.

Arceus is a Mythical Pokemon, and its location and method of capture vary depending on the game. In the official Pokemon games, Arceus is typically obtained through special events, not by finding it in the wild.

If you're looking for information about a specific fan-made game, you'll need to provide more details like the game's developer or platform.