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Some people got hacked HA 2nd and 5th gen starters through Pokebank and bred them on X/Y. The Hidden Abilities passed to the eggs, but supposedly, they couldn't be used in online battles. They could, however, be traded.
Now, what happened to these Pokemon is beyond me. I'd call bullshit (due to the fact NO ONE ever trades them or claims to have them) but I saw pic related and it looks really legit.
I wish I knew why people aren't asking to have these Pokemon traded, though. I've been begging for someone to trade me a Contrary Snivy since Japan got Pokebank and I've either gotten ignored, or have had people tell me they're sure they don't exist.