Yes it can, they have an equal chance on winning depending on the moveset and item/plate they're holding.
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
Arceus of course.
It depends on the move
darkrai
Arceus
arceus because he is able to transform into any type & learn almost any move of its type.So arceus is the answer.it'd kick mewtwo's butt. and for more proof i battled lv.100 mewtwo against my friends lv.100 arceus. Moves arceus: punishment,extremespeed, perish song,flamethrower. moves mewtwo:aura sphere,shadow ball,phsychic,thunder. so its arceus
shiny is simple a effect that some Pokemon have it is nothing speacial
Arceus will win big time because Macicarp is a weak Pokemon
he has a shiny head
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.
Arceus obiously
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.