If you like Pokemon then Arceus would lose if you like Assassin's Creed Arceus would lose Because Ezio would blow Arceus's head of this would be the noise BOOM BOOM Get a life!
____________________________________________________________
EDIT: You can't compare fantasy to reality, but if you could im pretty sure fantasy would win, even in this case.
Ezio
batman would.
Arceus of course.
Heatherblaze's Opinion: I would say, Ezio. Because Ezio, has a gun, which, you can aim, fire, and hit. Altair falls over, dead. Ezio is more advanced from more bloodlines of assassins, so there is another advantage. Well, I just proved my point. It can be assumed that Ezio would be able to beat Altair. Altair was raised to be an Assassin from birth, but Ezio has better equipment like the hidden gun and uses a fresher, faster fighting style. Ezio would most likely win.
It depends on the move
darkrai
Altair would win. Ezio is good. He has dual hidden blades and can do a lot of stuff. But in the Assassin's Creed universe, Altair is considered the greatest assassin of all time.
Arceus
well it depends on Arceus's Type If its normal or water Arceus will win because normal types resist fire types and reshiram and fire types are weak against water but if it was a ice,grass or dragon Reshiram would win hope this helped :D
If the Starly has a focus item to survive a one hit KO, and knows quick attack, the Starly would win. If not, the Arceus would pown it.
Totally, Altair's specialty is being sneaky and nobody noticing him, as Ezio is good for large brawls against multiple guards. If Altair and Ezio were put in an arena to fight eachother, Altair could not hide and would not have the element of surprise. With Ezio's superior brawling skills, he would win.
Arceus obiously