By an Event or by using action replay
Yes there is
By action replay or events that that come rarely
you get oaks letter from a Nintendo event in America
its an item you bring to that rout east of the league to ge shaymin fljkfdljkfljkfdlk;dslk;lfdlkfdslfd
you first get to finish your sinnoh pokedex and then you go to pal park to get oaks letter then go to the rock near Pokemon league
you don't use wifi to get the oaks letter.anyhow that's goes to get shamin. ONLY Pokemon PEARL/DIAMOND can get shamin.so how to get the oaks letter? you have to beat the elite four.then you fly to the Pokemon league go down the watterfall.NOTE! you only can get the oaks letter from pearl or diamond versions.go on Google.com to get through.! note you have to have the national pokedex.at the end you will see professer oak talk to him after that go to Google.com to find out more!!!!!!!!!! cheres
You can trade with someone who has Shaymin, but that's your only option. To get Shaymin, you need Oak's Letter or Action Replay.
u need oaks letter that's where shaymin is get oaks letter.
Do not let a Pokemon hold it for it to work.go to floaroma meadow.