You will need to use the Action Replay to get Oak's Letter, because the event has expired now.
You don't
No.
complete the national pokedex and go to canalave city in the pokemart and theres a man by the counter talk and he will give you give you gifts one of them may be oaks letter.
By action replay or events that that come rarely
you can only get oaks letter in Pokemon platinum by an event. if you have action replay, you could also get it from an event there.
you have to listen to prof. oaks radio show and he will say there are a bunch of murkrow at a certain route
its an item you bring to that rout east of the league to ge shaymin fljkfdljkfljkfdlk;dslk;lfdlkfdslfd
A lot of numbers and or letters
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
Do not let a Pokemon hold it for it to work.go to floaroma meadow.
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
If you're using an action replay, look at the bottom left of the top screen when Pokemon pearl is in the action replay.The number and letters there are the game ID. If you're using an action replay, look at the bottom left of the top screen when Pokemon pearl is in the action replay.The number and letters there are the game ID.