Rather than make him broken, I decided to make him just less terrible.
BST: 415 -> 490 (+75)
HP: 100 -> 140 (+40)
Attack: 70 -> 70
Defense: 70 -> 110 (+40)
Sp.Atk: 65 -> 50 (-15)
Sp.Def: 65 -> 70 (+5)
Speed: 45 -> 45
Moves:
Poison Fang (50% chance to badly poison)
Elemental Fangs
Draining Chomp-- POISON, Physical, 60 Power, 100%, 5PP, Recovers 100% of damage dealt
Bite 60 Power -> 80 Power 25PP -> 15PP
Precise Blow-- NORMAL, Physical, 20 Power, 95%, 15PP, has a 50% chance to cause paralysis
Drill Under-- NORMAL, Physical, 90 Power, 100%, 10PP, has a Focus Punch start up, negative priority, and a 33% chance to dodge the enemy's attack before hitting
Now Serene Vest can be a thing to an extent, even if dick sucked ghosts are running around.