How do you get to the relic forest in game Pokemon Colosseum?

You can't get to the Relic Forest in Pokemon Colosseum. The Relic Forest is a location from Pokemon Ruby, Sapphire, and Emerald, not Pokemon Colosseum.

If you are looking for a similar location in Pokemon Colosseum, it might be the Realgam Tower. This tower is home to the mythical Pokemon, Mew.

To reach the Realgam Tower, you need to:

1. Complete the main storyline of the game.

2. Find the hidden entrance in the Shadow Pokémon facility. This entrance can be found by interacting with a specific shadow Pokémon.

3. Travel through the Realgam Tower to face the final challenge and obtain Mew.

Let me know if you need any other help with Pokemon Colosseum!