Because of immature teenagers who record themselves swearing, making it say that every time they use Chatter. --- Dunsparce pwns. Detroit Lions pwn. Everything pwns, so long as it's not the best/ no one else likes it.
I can't believe this. Why not just have chatter come out the other end as a garble, where what you record stays the same in your game. Why ban a Pokemon for something that trivial? Better yet, why make Pokemon like that if you're going to regret showing it off later?