I have Full R.Ludroth gear, except Barroth Chest. a Dmg 182 sword, and just cant seem to kill him. I am no good with Switch Axe, GS, Pole, Crossbow, only feel comfortable with sword/shield and just cant seem to kill him. :(
Use a frog to fish him out of the water. Use a Lance with an elemental attack (read the Lance FAQ posted here for more details.) He is a pushover with this setup.