In the days leading up to the Pokémon X and Y release, Nintendo sent retailers in Brazil a reminder of the games’ release date, though “warning” may have been a better word. In it, Nintendo advised that any who broke the worldwide October 12 release date would not be receiving future product shipments until after the initial release. For any transgressors, that means no launch-day sales, which, hectic as launch days are at game retailers, are great for profits. I did not hear of any large early releases of the games in Brazil like there were in Italy and Canada, so the ultimatum must have worked pretty well.
Source: Go Nintendo