Oak's letter is not possible to get yet without action replay. So unless you have action replay you cannot get Oak's letter which means you cannot get shaymin. Sorry about that. That only answered half the question. You need to go in a poke-mart after that (any one) Then talk to a man in green, he will give you a letter. Then i think you go out and oak comes running says go to route 224 or you appear there idk, then you will see something running follow it into a rock go in. You will go through a long patch of flowers at the end you will battle shaymin. he's lvl 30 but extremely hard to catch. He he i also told you how to get shaymin. Enjoy your shaymin
you must of mised the Pokemon event
Via Nintendo Wifi.
no you have to get is from an action replay or go to a Pokemon event
You use it at the smooth rock. Then you can get shaymin.It is on route 224.
You have to get it from an event, but there hasn't been any event lately for Pokemon diamond/pearl. Most of the events are for platinum now, oaks letter was given out a feew weeks ago for platinum. You can keep a look out though by going to serebii.net
Use the Action Replay go to pokemonaction replaycodes.com for the code.
you go to route 224 in Pokemon diamond and oak will be there and u can catch shaymin!
It is impossible in the conditions you specified.
you cant its a key item but you gan trade the shaymin
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 have to get Oaks letter an a special day and go to victory road then to the ocean and professor oak will be there with a rock and shaymin will appear.
to get professer oaks letter then you must first have the mystery gift from Jubilife city.You must also have the national pokedex. Save your progress.Then turn your Nintendo ds on and select mystery gift.Then you must select via wi-fi connection and choose oaks letter. then you must play Pokemon diamond and go to any poke-mart and talk to the man in green and he will give you oaks letter. ----------------------------------------------------------------------------------------------------------------- Can u do it any time, or do u have to do it by a certain time?
with a Nintendo event or an action replay.