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Toxic

From the Pokémon Wiki, a database for the Pokémon series that anyone can contribute to

This move badly Poisons the foe. Does not poison Poison-type pokemon. It is badly poisoned instead of regularly poisoned.

All pokemon can learn this move by TM06 except Magikarp, Ditto, etc

By Level Up

269 Dustox Lv 38 Bug/Poison
315 Roselia Lv 37 Grass/Poison
316 Gulpin Lv 28 Poison
317 Swalot Lv 30 Poison
416 Vespiquen Lv 27 Bug/Flying
434 Stunky D/P Lv 20 Poison/Dark
434 Stunky Pt Lv 27 Poison/Dark
435 Skuntank D/P Lv 20 Poison/Dark
435 Skuntank Pt Lv 27 Poison/Dark