Veluza is better since it is a more faster offensive Pokemon compared to slowbro
and has a set up move, fillet away. Even though fillet away isn't the best set up move its easier to pull off in a playthrough. Here's a moveset
Veluza @Life Orb
Ability:Mold Breaker
Nature:Anything but preferably Jolly or Adamant
-Aqua Jet/Fillet Away
-Liquidation
-Crunch
-Psychic Fangs
