Any tips on how to beat it???

A few,you can use Rikku's mix of 9999, make sure you underwater characters are up to level. I sugest equiping armor with pertry protection because he will attack with it more then once. Make sure you have some one who can use healing magic. He isn't particualry strong, but since you can only use Tidus, Wakka an Rikku underwater I suggest you keep their levels high enough.

he was a right bastard, he killed me the git and then my sister wiped my save game so I didn't get chance to go back with a stratagy and beat shit through him like I will of course the next time I encounter him which will be somewhere around June 12th since my exams finish on June 11th and I'll be doing a 24 hour quest on June 12th to get it done cause I'll be too hammered to go out on June 12th anyway cause of the night before.

He is beatable in a No Sphere Grid challenge. If you use Rikku's Trio of 9999, then one hit of Tidus's Blitz Ace will kill him. In fact, I've actually killed him with a single Slice and Dice.

Well cant give you anymore from what been said above but I do stress that you MUST have strong underwater characters and have protection against petrification, if not.......your dead within a few hits...:(