You've arrived just in time for the tournament. Unfortunately, you're not invited, so you will need to do some work before Phil will allow you to enter. Start towards the Coliseum Lobby, and look under the right guard statue to find a Blue Trinity containing Dalmations 22, 23, & 24. You will be coming to the Coliseum quite a bit. Talk to Phil, and then head over to the pedestal. Attempt to move it, then return to Phil and speak to him once again. Following the cutscene, speak to Phil once more to start the trials.
Getting into the Tournament
Beginner
This first test is rather easy. You have a certain amount of time to break all the barrels in the area. You shouldn't have any difficulties with the first trial.
Advanced
The next round is a little more advanced. Here you'll need to concentrate by using one barrel to destroy a group of others, and you must be quick about it. This might take several attempts to complete, but don't give up.
Once you have completed both training exercises, head back to the Coliseum Gates to speak to Hades. After receiving the ticket to the Preliminaries, head back to the Coliseum Lobby and speak to Phil once again to start the Preliminaries. Suck my Dick You Little pussy Bitches!