You cannot get Oak's Letter in Pokémon Platinum without cheating since it's an event-only item. The only Oak's Letter event has already ended but it was active between September 28, 2009 and November 8, 2009.
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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
first you have to get oaks letter on mystery gift if you get that then i don't know
u dont know cos u can't read it check first if u can't u can't
No because it does mater
Oak's Letter (L+R) (US Version) 94000130 FCFF0000 62101D40 00000000 B2101D40 00000000 0000B5D4 00000009 0000B5D8 00000000 D2000000 00000000 Other cheats found on projectpokemon.org in the forums.