Holy Arceus's golden c*ck! Its Arceus! There is so much to do with this pokemon it is unbelievable! Lets start with some Offensive sets. (And I mean offensive in both uses of the term)
F*** You Mega Ray-Quay-Quay
Arceus @ Pixie Plate
Multitype
Timid (+Spd, -Atk)
252 SpA, 252 Spd, 4 Hp
- Judgement
- Recover
- Flamethrower/Fire Blast/Blast Burn/Apocalyptic Hell Fires
- Earth Power
This is a pretty solid Arceus set aimed at killing all dragon type pokemon (I'm looking at you Mega Rayqueza). Flamethrower will destroy Steel type pokemon like Aegislash and Earth power kills things like Primal Groudon and Heatran. The EV's are to maximize speed and outspend even Mega Rayqueza and Mega Salamence before he mega evolves. Why god is timid is beyond me, but he is. If you want, you can replace Flamethrower with Fire Blast, or Blast Burn (for overkill only). I don't why Arcues doesn't learn Apocalyptic Hell Fires, but it is unfortunately out of the question.
F*** Your High Offense
Arceus @ Iron Plate
Multitype
Bold (+Def, -Atk)
252 Hp, 252 SpD, 4 Def
- Cosmic Power
- Recover/Rest
- Judgement/ Will-O-Whisp
- Toxic
1. Set up Cosmic Power. Heal as necessary
2. Use Toxic (or Will-O-Whisp)
3. Use Judgement and rain death on all who oppose (if you can
4. ???
5. Profit
The goal is simple. Set up Cosmic Power, and you win. GG. Game over man. Recover is a great move quick heal move, but Rest gets rid of burn (you don't need to worry about toxic because you are steel) and stalls out your own Toxic and Will-O-Whisp. Judgement is always a powerful move, but Will-O-Whisp lets you hit steel types, and shuts down Sacred Sword Aegislash/Terracion from ruining your day. You just need to toxic everything else.
F*** Everything
Arceus @ Life Orb/Sitrius Berry
Multitype
Adament (+Atk, -SpA)
252 Atk, 252 Hp, 4 Spd
- Swords Dance
- Extreme Speed
- Extreme Speed
- Extreme Speed
- Recover
- Earthquake
This is the set of scumbags (not really, but it is good). You set up 1-2 Swords Dance, and spam Extreme Speed until you win. Recover could win you the game by letting you set up more, and Earthquake is there to kill all Steel/Rock/Ghost types.
The Last Hope
Arceus @ Life Orb
Multitype
Jolly (+Spd, -SpA)
252 Atk, 252 Spd, 4 Hp
-Swords Dance
-Last Resort
Fake Out Last Resort Ambipom is amazing (in VGC at least) so lets make this happen. Turn 1. Swords Dance. Turn 2. Last Resort. An Ambipom that's not at +2 and has 100 base attack does serious damage with Last Resort. Now, bump the damage scale up to 11, and we are talking about something not even a bulky Primal Groudon can survive. Resisted hits will be doing amazing amounts of damage, it is crazy! You have to look out for ghosts, but other than that, you should be fine.