get oak's letter from a event. i recommend getting wifi so u can get that shaymin from mystery gift.
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u cant.
Shaymin, Darkrai, and Arceus are event-only Pokemon which an Action Replay is required to catch them today or you can trade for them with a close friend.
you go to route 224 in Pokemon diamond and oak will be there and u can catch shaymin!
Darkrai is a dark type of Pokemon. You can catch one in Pokemon Diamond version on Newmoon Island but you need a membership card.
You cannot catch Shaymin in Pokemon Black or White. You'll need to trade for it from the GTS or transfer it from the Transfer Lab.