Arceus (Aruseus in Japanese) is the last Legendary Pokémon of Generation 4.
Arceus has a base stat of 120 in every stat, giving it a base stat total of 720, which allows it to surpass some of the strongest Pokémon. Arceus' ability allows it to change colors and types based on any held Plate items.
Arceus is considered to be the "God" of all Pokémon. There is a debate on whether or not Mew created Arceus, or if Arceus made Mew to help them rule. As far as most people know, Arceus is the original Alpha Pokémon. It is proven that Arceus created Dialga, Palkia, Giratina,Mesprit,Uxie and Mesprit. Its is unknown if he created the rest.
Arceus is considered genderless like most other legendary Pokémon (e.g. Dialga, Palkia, Giratina, Mew)