It depends on the user's choice, of course. However, it is universally agreed upon that because Arceus has the highest IVs, it is the strongest Pokemon. Also, because it is the 'Creator' (akin to a god in the Pokemon world), it is probably the 'original' Pokemon and therefore the strongest. It also has no real type, but its type depends on the Plate it is holding.
For example, if Arceus holds a Steel Plate, its type will change to steel. If Arceus then faces a powerful Pokemon that knows Earthquake, it can switch its Steel Plate for a Plate that will not be super-effected against that Pokemon.
Arceus cannot be captured legally, but there are Nintendo events you can participate in to get Arceus legitimately.
Pokemon The First Movie is the BEST Pokemon movie ever.
Arceus is the best Pokemon ever and it will always be it
the best Pokemon are mewto and the rarest Pokemon ever mew.
it is not the best MARGIKARP is the best ever NOT
Personally I think Eevee is the best Pokemon ever because, it can evolve into seven different types of Eevee.
for a girl what likes cute Pokemon yes, but the best Pokemon is arceus
I personally think that the best Pokemon in Pokemon black is Reshiram because he is the legendary!
Arceus
No.
arceus
i think that the best Pokemon you can ever have in Pokemon pearl is Empoleon or Palkia not rare^ rare^
all the ledgendary Pokemon are the best they are equal