The exclusive #500th Pokemon made for Pokemon: Jesus Editon. You have to accept Jesus as your savior to unlock Tristan, who is located in Jerusalem. You can only catch Tristan with a Jew Ball, which is recieved when you defeat the Muslim Infidels, earlier in the crusade. Tristan is level 95, making him the strongest Pope in the game.
"Yeah, I tried catching Tristan with my Charzard. ******** Pope spilled holy water on it KO'ing it."
This is a definition of your name.
And here are some more:http://www.urbandictionary.com/define.php?term=Tristan