It is actually called ARCEUS (ar. see. us) and my friend jlube told me that he is the strongest most powerful Pokemon ever. to get him go to (enter a question here)and then type inhow to get arceus...
route 38 in Johto. just go through the grass and you will find a level 15-17 tauros in 1-5 encounters or you could go to the safari zone and choose the "savanna setting" you will find a level 17...
you need to go to ecruteak city and go right and before you go into the cave someone woll bump into you and give it to you. you should be able to use it right off the back