Well there is a way to make it Legal without Munchlax, Snorlax Learns Self Destruct via TM in Gen 1 but is a Munchlax Exclusive in Gen 4 onwards, so if you change the Game Origin around for whatever Moves you need, it may Help out
Sorry Bout that, a friend told me that a Non-Japanese Region 3DS Won't trade the Event unless it was from a Japanese Region with the Japanese name, so I'm guessing its Only the Region that matters, and not the Nickname?