No, but it helps if you do catch it. Arceus has a special ability called Multitype. When it holds a plate, it transforms into that plates preferable type. (E.g. Stone Plate = Rock Type, Zap Plate = Electric type). it is not proven when you get all of the plates arceus will appear, but what you really need the azure Flute.
No, you do not need all of the plates to catch Arceus. You can use the plates to change Arceus' type, though. Arceus is only available by event (which has long since passed). You can also use an AR (action replay) to hack the game and get an Arceus, all without plates.
you ned to go to www.codejunkies.com
You get them through out the game
See the following link for a complete listing of Plates and their locations: http://bulbapedia.bulbagarden.net/wiki/Plates
If you have Arceus, then all you have to do is give it one of the plates that can be collected around Sinnoh, for example, the Splash Plate. Then the Arceus will change its type.
Find all plates and got to spear pillar................. TRICKED YOU....you need the Azure flute or action replay.
there is none
There isn't one you have to get items you don't need in your bag and use the item code.all the plates ( except the rumored ??? type plate ) are listed.
you use them to get arceus whitch is a very rare Pokemon but you also need certain pokemmon my friend mikey is trying to do that
There is no Unknown Plate for Arceus, there are only plates for each type.
it is very simple.to get arceus you have to get all the plates like an icicle plate.also you need dialga,palkia,and giritina in your party.last you go to where you got dialga the first time and trash the plates.there will be an earthquake and you go up the stairs.wala an arceus level 80.
To put it simple, no. Any mart. Holding L & R then talk to the man in the green, he'll give it to you! :) Also, once you have Arceus, he can change colors. :) (Put different plates on him) Go here: http://www.serebii.net/diamondpearl/arceus.shtml to see all colors with plates. (Shiny and non-shiny)