cynthia
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You get oaks letter from a special event that is on the internet or wifi. you get it from any poke-mart in sinnoh
with a Nintendo event or an action replay.
kind, eked, oaks, tank
No because it does mater
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