Easier to just open battle spot, enter a quick 1vs1 free battle. saves much more time than flying to lumiose city>battle institute, can do it from the daycare..
As for a Timid Nature Arceus, the best thing in my opinion is to make it Ghost Arceus and pick a moveset as recommended by smogon:
https://www.smogon.com/bw/pokemon/arceus-ghost
in your case with the ev spread you did, the Swords Dance option looks to be the best choice with shadow force or shadow claw being the main attack of choice, swords dance for when you are able to safely get it up, brick break so you can attack Normal types, and recover for when you can safely recover health, i can also recommend replacing recover with dazzling gleam if your the type like me who doesn't like to recover health and rather use the move slot for an extra attack.
If you were attempting an Arceus-Normal type that's a special attacker.. all i can say is, that would be a bad idea.. Arceus is easily outsped by many pokemon that have access to fighting moves who would potentially 1 or 2-hit KO it before it could attack (i.e. mewtwo's aura sphere).. Normal Arceus is best as a normal Physical attacker, which is why his primary move in that case is Extreme Speed, as he can potentially one-shot those fighters with extreme speed.
Another option for Special Attack Arceus is to take advantage of the new Fairy Plate, and give it Dazzling Gleam, Psyshock, Thunderbolt, and Calm Mind (or Flash Cannon)