From Bulbapedia, the community-driven Pokémon encyclopedia.
Poison Tail is a Poison-type move introduced in Generation III that deals a small amount of damage. May also poison the foe.
In the anime
The unique characteristic of a Pokémon using Poison Tail is that its tail turns light purple, is a physical attack that may poison the opponent.
Seviper. The body part that uses the move is from the end of the purple ring in its tail to the tip of it. Seviper uses its long body to amplify the force of the move and the damage.
In other languages
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