Ok, heres what you do. have a friend attack a mob that can't swim and kite it until it has low health and then have your friend go into the water. Now that your friend has aggro, you can start attacking the mob. It will be on evade because your friend has aggro. Occasionally get ur friend out of the water so that the mob doesnt run away. Even tho the monster is on evade, you'll still be getting the skill points for the weapon that you're using.
Enjoy!