No, that's Mew. Mew has DNA strands of ALL Pokemon in it and can use Transform and every TM/HM. It's the God of Pokemon.
Arceus is little more than an Eevee with ultra-uber-l33t stats. Multiple forms, multiple types, a few flashy attacks, etc....
Mew is God. Not the Christian God that kills every sinner and tells people to kill their kids for the lulz - the God that really exists and is incomprehensibly perfect and supreme and stuff. Arceus, on the other hand, is like Ra or Zeus or Chthulu or something...