Oh lord its wailord one of the most odd water types ever Its just...meh
Overview
Ability's
Water veil not bad but not very useful
Oblivious ^ pretty much the same
Pressure Useful for stalls
HP: 170-Amazing HP some of the best
Attack: 90-Its...okay not bad just not good
Defense: 45-Awful
Sp.Atk: 90-Its...okay not bad just not good
Sp.Def: 45-Awful
Speed: 60-Fast enough to pull of a good scarf set slow enough for a trick room

Sets
Physical wall...? Item:Leftovers EVs: 252 HP / 252 Def / 6 SDef
Nature: Relaxed
Ability Pressure
- Curse
- Rest
- Scald
- Earthquake
Wailord really can't do much sadly This set can make him into a good psychical wall i suppose

Trick room sweeper:item choice specs EVs: 62 HP / 196 Atk / 252 SAtk
Nature Quiet
Ability Water veil
- Water Spout
- Ice Beam
- Hydro Pump
- Earthquake
A basic set for wailord the trick room sweeper water spout for massive damage the rest are just their

Choice scarfer: Item Choice scarf(duh) EVs: 60 HP / 196 Atk / 58 SAtk / 196 Spd
Nature: Naive/hasty
Ability water veil
- Water Spout
- Zen Headbutt/Ice beam
- Earthquake
- Heavy Slam
A pretty basic scarf set out speed stuff try to kill

Opinion:As wall bulky water out classed by almost all others as a trick room sweeper out classed by Octillery which is slower and stronger and also has water spout as a offensive threat swampert is better all in all outclassed and suckish

Other options:Well a life orber would be neat but's its to slow and frail for it

What could of been Of:he had better defense base 60 at the very least he could be a great wall but no