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If another Pokemon inflicts burn, paralysis, poison, or bad poison on the wielder, then the enemy receives the same status. Self-induced status is not passed on. Poison and bad poison from Toxic Spikes is not passed to the foe. Synchronize will not inflict status on Pokemon immune to that particular status. Synchronize will not successfully inflict status previously transferred by Psycho Shift.
When the wielder is first in the party (even if it is fainted) when entering battle against a wild Pokemon, there is a 50% chance of making the wild Pokemon's nature correspond to the nature of the Pokemon with this ability.
Synchronize does see some use in the form of Mew. However, Mew is not seen as much as some people first expected when it was brought down from Ubers, even though it is a perfectly viable Pokemon. Other Pokemon with Synchronize such as Gardevoir have better abilities such as Trace, so really outside of Mew it isn't seen much, and doesn't have that much competitive use.
Found in Dream World