The results of a Toxicroak hyperfixiation, a rough Toxicroak 3rd stage evo sketch

Id call it something stupid like Toxicrash, or Venobatrax, the toxic crashout (yep) pokemon.

Give it a scrappy as an alternate ability, along with the already existing poison point and Dry Skin.

Id give it a new signature fighting and poison type move:

FIGHTING TYPE MOVE: Crashout: 90 base power, 100% Accuracy

-The user lets loose in an intense, aggresive, yet controlled, rampage. This move's base power increases by 10% for every pokemon on the ally team that is afflicted with a status condition (Burn, Poison, Paralysis, Frozen, Sleep), including the user itself. Burn does not affect this moves damage.

If the whole team is statused it comes out to 144 base power which is high, but unlikely. Max amount of teammates statused is prolly around 2-3, which is 117 bp.

POISON TYPE MOVE: Bloated Blight, +5 priority

-The user inflates venom-filled sacks around its body, creating a protective barrier that badly poisons (toxic) any foe that comes into contact with it. Steel types do not get poisoned.

For its stats, i think evolving into a bulky attacker with medium speed would be good, synergizing well with dry skin and the high attack stat.

Base stats:

HP: 95
ATTACK: 120
DEFENSE: 105
SP. ATTACK: 86
SP. DEFENSE: 95
SPEED: 97
BST: 598

this came about after a day of trying to make toxicroak work in the SV OU singles ladder outside a rain team on Pokemon Showdown.