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!!!!
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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
No because it does mater
YOu CAN GET A SHAYMIN BY getting the preffesors oaks letter from an Pokemon event or by using an action replay. for more info go to yourpokemongo.webs.com
you go to route 224 in Pokemon diamond and oak will be there and u can catch shaymin!
You can't get it without using action replay. The code is down below 94000130 fcff0000 B21c4d28 00000000 B0000004 00000000 0000aa3c edb88320 2000aa68 00000009 D2000000 00000000