ARCEUS
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Arceus is the GOD of all Poke'Mon, and the plates eg.Sky Plate are used to change Arceus's type, and yes, arceus gets advantages and disadvantages of having them on.
So have a wide range of plates.
Hope this helps!
Fighting Type
arceus is normal type
You have to give it the plates you find. He changes to the type that it would normally boost the power of.
Judgement is super-effective to all Pokemon types because of the fact that Arceus can become any type. When Arceus equips a plate to it, it changes type according to that plate and thus Judgement changes type as well. So, if you gave Arceus an Icicle Plate, he becomes an ice type thus Judgement becomes an ice type, dealing super-effective damage to dragon, grass, ground and flying types. It aslo gains STAB
I am assuming that you mean which type is the best. there is none. they all have their own strengths and weakness's.
To change Arceus's type, give it an item plate. For example, a Draco Plate changes it to the Dragon type. It changes to whichever type it says it boosts the power of. It is exactly the same as if it is that type.
It has 100 power and 100 accuracy and it changes type due to what type Arceus is
Arceus not archeus is an incredibly strong Pokemon as it starts on lvl 80 and has the ability allowing it to change type. At lvl 100 arceus learns judgment which only it can learn as judgment changes type with arceus. Arceus' judgment has 100 power and accuracy with same type bonuses. Arceus is the trickiest Pokemon to kill as you never know what type it could be. Arceus changes type on what plate it holds eg: Draco plate=dragon type. As well as judgment arceus can learn: hyper beam, perish song by leveling it up. its base stats are 120 for all areas.
Some peeps thinks its rock cause thunder does no effect to rock types hmm.. pikachu, arceus thunder, jolteon and blah blah and all the other Pokemon they'll all weakness to fightin type even Pokemon cards says it too!! check in Google! the cards i mean yall show u picture so ya sorry .. THUNDER TYPE IS WEAKNESS TO FIGHTING TYPE yhh i'd say FIGHTING TYPES :)
the only Pokemon in any game that changes color when something happens, is Arceus. It changes color when you give it a plate of differrent kinds. For example: if you give an Arceus a toxic plate, it will turn purple and become a poison type. If you give an Arceus a splash plate, it will turn blue, and become a water type, etc.
no pokemon can beat arceus arceus is a pokemon of hell his weakness is electrec no pkemon can beat hell.
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.