How do you acquire the Gladiator title?

In order to receive a title of gladiator, your character has to be in the top 0.5% of the players in your respected Region. This means that the lowest possible rating always changes depending on the people who are in the top 0.5%. Aside from that, you will also need to have a minimum of 50 victories above 2400 rating in 3v3 rated arena mode.