Okay /vp/, some real life friends and I are starting a gym leader themed tournament. We've each chosen a type and are to build a team around it. I have chosen water, and thus far my opposition is:
Fire
Electric
Psychic
Dragon
Ghost
We are allowed one legendary per team.
I have no idea what I'm doing, and could think up no better place to seek assistance.

The only water legendary that comes to mind for me is Kyogre. So my team so far is as follows. Help with revisions is welcome (pokemon, abilities, movesets, etc.):

Kyogre
Greninja
Gyarados (Mega)
Lapras
Swampert
Slowbro/king
Thanks a lot, guys.