Toxiquak

Diamond +2: Its knuckle claws secrete a toxin so vile that even a scratch could prove fatal.

Pearl: The toxin made in its poison sacs is pumped to the knuckle claws through tubes down its arms.

Platinum +4: It has a poison sac at its throat. When it croaks, the stored poison is churned for greater potency.

HeartGold / SoulSilver: Swaying and dodging the attacks of its foes, it weaves its flexible body in close, then lunges out with its poisonous claws.

Black 2 / White 2: The croaking that Toxicroak produces before a battle is for churning the poison it has stored in its poison sac.

Sword: It bounces toward opponents and gouges them with poisonous claws. No more than a scratch is needed to knock out its adversaries.

Shield: It booms out a victory croak when its prey goes down in defeat. This Pokémon and Seismitoad are related species.

Legends: Arceus: Its crimson claws contain a virulent toxin. This toxin can be made into a tonic by diluting it, mixing it with several types of wild grass, and boiling it down over two days.