What do you want to do with Floatzel?
I'd go with Pursuit for revenge kill options.
Floatzel, currently, is my opener for my team. He can hit hard with his high attack and the high speed should get him first hit. The D/P analysis has
Bulk Up for this set, but I don't know if getting hit the first time (even though he can sweep the next turn) will help Floatzel in the long run.
I'm considering
Aqua Jet because it could be a "for sure kill" when the opponent has a little bit of HP and it gets STAB.
Pursuit like you said can get revenge-kill, but I don't know how many people would switch against a Floatzel, because he's not used often so not many people see him as a threat.
I think by just saying all of that, I think I'm going with
Aqua Jet but I still think
Bulk Up is a good move too. Any suggestions?