When it was introduced in Generation II being TM 36, mainly with Ekans and Arbok. It has a power of 90, a PP of 10, and an accuracy of 100. It is TM 36 and many Pokémon can learn this attack from the TM.
It is a damage inflicting move but also has a 30% chance of poisoning the target.
Outside of Battle
It has no other effect outside of battle.