None of them. You need an event.
Other person's answer: get oaks letter and go to the tablet oak will be there and shaymin will appear My answer ;In order to get the lengendary grass pokemon: Shaymin, you must first receive Oak's letter or invitation to tell you to go to the lab from Twinleaf Town. After, Shaymin will appear.
shaymin
Shaymin is an event Pokemon in diamond, pearl and platinum to get it you need oaks letter then he will appear on some route apparently if you talk to him and show him a Pokemon that likes you a bridge will appear and will lead to shaymin.
You get Oak's letter then go to the weird rock by Victory Road. Oak will be there and Shaymin will appear.
In sept 28th- nov 8th, shaymin will appear platinum...i believe arecus will appear before 2010.http://www.pokemonplatinum.com/#/pokemon/shaymin/
This month you can get Shaymin in the US and next month you can get Regigigas, the Shaymin event is February 8th-14th and the Regigigas event is March well I forget when it starts, but it ends on the 21st.
You get Shaymin on the path that goes North-East out of victory road. This route will appear when you defeat the elite four. However you need an event to get Shaymin.
Unfortunately, shaymin and arceus don't appear in Pokemon mystery dungeon 2. It has every Pokemon from bulbasaur to darkrai, but not those 2.
Shaymin was only avaible in Nintendo Events which, i think lasted for a month. You'll more than likely need to trade it over wi-fi...
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.
A new moon may appear once or twice each month.
You need mystery gift to get Oak's Letter. and you need to be able to get to Route 224. You need to go to a large rock and press A. Then Prof. Oak will come and say stuff and Shaymin will appear. It will run away, and you have to run through the Flower Paradise after Shaymin. BIG TIP: BRING A LOT OF ULTRA, GREAT, AND TIMER BALLS WITH U!! Shaymin is ranked 45 in the catch rate. After a while, u will go up a hill and SHaymin will be there. Hope this has Helped. ;)