Shorter than Asch's temper!
The Meltokio Coliseum is of course located in the Imperial City of Meltokio. It is where the individuals of Lloyd's Group can fight there way through the hordes of monsters to gain a title and a powerful weapon. In Zelos' case, he can fight through twice and fight his sister Seles Wilder. If he manages to defeat her he gains the powerful weapon Excalibur.