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If another Pokémon inflicts burn, paralysis, or poison on this Pokemon, then the enemy receives the status as well. Toxic poison is passed on as regular poison. Self-induced status is not passed on. Poison and Toxic poison from Toxic Spikes is not passed to the foe. Synchronize will not poison Steel-type Pokemon or those with Immunity, and it will not burn Fire-type Pokemon or those with Flash Fire or Water Veil.
When a Pokémon with this ability is first in the party (even if it is fainted) when entering battle against a wild Pokémon, there is a 50% chance of making the wild Pokémon's nature correspond to the nature of the Pokémon with this ability.