I beg to differ, aron is very good at that. I made a whole team out of it.
Aron @ Shell Bell, lv1
Sturdy
Endeavor
Roar
Aerial Ace
Protect
Get attacked, have 1 hp due to sturdy.
Use Endeavor, your opponent has 1 hp left.
Shell bell activate, you gain 1/8 of the damage as hp back, as you have 12...