Sorry, but you cant.. You must use mystery gift for most things on heart gold actually. That's the only way some things appear in the game. ;) I am on heart gold every day. IF your Pokemon need raising, you can trust me. I promise i don't steal others Pokemon. :P
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You can't anymore it's IMPOSSIBLE You can only obtain Oak's letter as a mystery gift. This mystery gift was given at selected cinemas for the Pokemon Shaymin Movie. This event has now ended, making it (for the moment) impossible to get Oak's letter without action replay.
first you have to get oaks letter on mystery gift if you get that then i don't know
You first needed to get it from mystery gift. If you didn't, you can't get it anymore. If you already have it, you can go to any Pokemart to pick it up.
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?
I am afraid you cant get it at the moment there is only two ways to get the oaks letter along with the azure flute and the membership pass is to go to an event that is giving them away. the other way is to "hack" your game using a cheat device like the action replay however using these devices can seriously ruin your game and sometimes delete your game altogether. at one time during the year there will be an event going on you go to a gamestop and it has instructions to get oaks letter but you have to have mystery gift.....you click mystery gift then it will say received oaks lette then you go to the nearnest pokemart and a guy will give it to you.....or you can just use gameshark or action replay!! hope this HELPED!!!!