mushroomedmario
ssb4life
But because this form of communication is greatly affected by the distance between you and your opponent, your brawls may not run smoothly if you’re really far apart—like, for instance, if you’re connecting between Japan and America.
http://www.smashbros.com/en_us/gamemode/wi-fi/wi-fi01.html
not region locked, but it may not run smoothly