There is the tweaking glitch...look it up.
you must send him over from a pearl or diamond or cheat (Action replay or hacking)
you cant
The Pokemon that she talks about is Shaymin, and there are to ways to get, mystery gift or action replay code.
=Its not possible but getting aceus is without action replay=
The only way to get Oak's Letter as a Mystery Gift was to wait for an event, go to that event, and then download it as a mystery gift. However, the event to get Shaymin in America for Diamond and Pearl has already passed, so it is impossible to get it as a mystery gift now. There has already been a Pokemon Event for Shaymin (what you need Oak's Letter for) for Pokemon Platinum, so that has passed, too.
get shaymin on mystery gift or trade from mystery gift and go to the blonde lady (with shaymin) talk to her and she will give it to you
You can't
use the mystery gift
theres no way. you cant catch arceus without action replay either.
no......in pearl and diamond with action replay
you can get Shaymin by the action replay or through sept.28-oct.8 with the mystery gift.
nope