No there is no other way but doing games using wi-fi connection
that was an event to get shaymin! i dont think you can get it the only way to get oaks letter is from an AR code
Why do you need Oak's letter anyway?
you use a action replay and use it to get oaks letter
get the oaks letter cheat on the action replay and talk to the guy in the pokemart
u can put a cheat on ur action replay for oaks letter
You get oaks letter from a special event that is on the internet or wifi. you get it from any poke-mart in sinnoh
u need oaks letter that's where shaymin is get oaks letter.
Not that I've heard of.
You must have downloaded it from the event back when it was happening. Otherwise, Action Replay is the only way to obtain it.
Nintendo event or AR
you get it with a Nintendo event
no