use mixed rayquaza, it can lure groudon easily and destroy it which enables rock arceus to sweep.
I mean:
Rayquaza @ Life Orb
Naive nature
4 Atk / 252 SpA / 252 Spd
- Outrage / Earthquake
- Extremespeed
- Fire Blast
- Draco Meteor
and there is a huge extremekiller weakness and rock polish groudon weakness. go with skarmory over ditto to check these. you dont have a ghost to block
spin but I guess that you can deal with it for some time. use the specially defensive spread ( 252 HP / 252 SDef / 4 Spd ) with careful nature and roost/whirlwind/spikes/[taunt/toxic]. it can even whirlwind mewtwo if you need. trust me skarmory is amazing.
If you really need an item for Darkrai I suggest Blackglasses or Expert Belt since they boost its attacks by a certain amount and don't cause it to die quickly. On the other hand, Life Orb is the more default option but it makes Darkrai a one-shot glass cannon that can't switch in twice to set up. Lum Berry is the final option to soak random TWaves and even opposing Darkrai's Dark Voids.
I recommend running quite a bit of Sp.Def on Tyranitar. The Ubers tier is full of powerful special attackers so even with Sandstorm boosting your Sp.Def, you are still going to need some investment. I usually run the standard 76 EVs but you could run a bit more in order to take a certain move from a certain Pokemon.
Also, for Ditto, I suggest making your IVs: 31HP/31Atk/31Def/31SpAtk/31SpDef/30Spd. This allows you to use HP Ice if your opponent uses Hidden Power. The 1 Spd point shouldn't matter too much since you have the Scarf.
I've tried that, it's weaknesses becomes problematic though Es rayquaza can dragon attack it, Arceus can ghost type attack it and uhhh spinnblocking does not concern me. Rc,s are just to break sashes and rape ho-oh sometimes. IGoing back to what zzzzzzzzz said about no Extremekiller check and no spinblocker, I have a solution to both.
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Giratina @ Leftovers
Ability: Pressure
Nature: Impish
EVs: 252hp/248def/8Sdef
-Will-o-whisp
-Rest
-Sleep Talk
-Dragon Tail/Roar
Trust me, not only does this thing wall Arceus and Groudon while functioning
as a spinblocker, but it takes FOREVER to kill.
You'll still lack an Arceus check, but there's another one worth trying.
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Lugia @ Leftovers
Ability: Pressure
Nauture: Bold
EVs: 252hp/236def/20spd
-Ice Beam
-Roost
-Toxic
-Dragon Tail/Whirlwind
This is a bit of variation off of the standard Lugia, but it worked for me. Roost
is used over recover because it gets rid of some weaknesses. Enjoy.
xD just for the record mew and smeargle also get transform and they are much better than ditto unless you are playing DW ubers