I actually think its the other way around. Synchronize is its normal ability, while Cute Charm is its hidden ability. Or at least that's how it's listed on the Serebi Coastal Pokedex.
maybe audino and chansey's line are fairies, but serebii just didnt update them, Togepi is pure fairy now, smogon confirmed that, but serebii still lists it as normal.
People really seem to love throwing the Fairy type around.
Which is partly why I dislike it, as it's so loosely defined that people seem to think that practically anything is worthy of being one.
It won't stop people complaining though, especially if milotic turns out to be pure water. I wouldn't really care but I know some people on here would be outraged if it wasn't a fairy