You wait for an event & talk to the man in the Pokemon center in Floroma town then go to the top of Route 224. Then talk to Prof. Oak & go down Seabreak Path & at the end look around. There you will find the cute Pokemon you know as Shaymin (don't get me wrong, I've done it).
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get oak's letter from a event. i recommend getting wifi so u can get that shaymin from mystery gift.
What to do after you talk to prof oak about groudon
The event scene in Pokemon Pearl where the player meets Professor Oak on route 224 is part of a Nintendo-sponsored special event in order to obtain the legendary Pokemon, Shaymin. The player must be involved in the special event to obtain the key item called Oak's Letter, and afterwards Professor Oak will appear on route 224.
Shaymin is at the top of route 224. You need Oak's Letter. After you beat the Pokemon League, go to route 224 with Oak's Letter and talk to him. He will show you the stone tablet and ask you whom you give your thanks to. When you tell him, the ground will change and there will be flowers everywhere. There will be a narrow path up ahead. Then shaymin will appear. Shaymin will look at you, then it will run away. Go down the Seakbreak Path to find Shaymin. (use your bike) Shaymin is located at the Flower Paridise.
you go to route 224 in Pokemon diamond and oak will be there and u can catch shaymin!