Ok, so the main gimmick here is to skill swap Mega Diancie’s and Blissey’s abilities so that Blissey is free to stall with Magic Bounce and Diancie can use Serene Grace with its moves. The rest of the team will be support for them.
Diancie-Mega @ Diancite
Ability: Magic Bounce
EVs: 28 HP / 140 Atk / 68 SpA / 20 SpD / 252 Spe
Hasty Nature
- Diamond Storm
- Moonblast
- Protect
- Skill Swap
Blissey @ Leftovers
Ability: Serene Grace
EVs: 236 HP / 252 Def / 12 SpA / 8 SpD
Bold Nature
IVs: 0 Atk
- Calm Mind
- Flamethrower
- Soft-Boiled
- Heal Pulse
I run Flamethrower on this for Steel types that threaten Diancie, and Heal Pulse to keep Diancie healthy.
Incineroar @ Aguav Berry
Ability: Intimidate
EVs: 252 HP / 108 Atk / 20 Def / 116 SpD / 12 Spe
Adamant Nature
- Fake Out
- Flare Blitz
- Knock Off
- U-turn
Cookie cutter set. Also I lead this with Diancie.
Togekiss @ Fightinium Z
Ability: Super Luck
EVs: 252 HP / 204 Def / 28 SpA / 24 SpD
Calm Nature
IVs: 0 Atk
- Tailwind
- Follow Me
- Aura Sphere
- Roost
My Tailwind setter.
Yes, I know I don’t have Serene Grace and Air Slash. Since half my team is weak to Steel types, I run Aura Sphere (and Super Luck, for a better chance of a crit) to threaten them out, as well as others who are weak to Fighting. I gave it the Z crystal because I didn’t know who else to give it. But I am willing to change it to Serene Grace/Air Slash, if necessary.
Tsareena @ Leftovers
Ability: Queenly Majesty
EVs: 248 HP / 4 Atk / 4 Def / 252 SpD
Impish Nature
- Feint
- Acupressure
- Knock Off
- Trop Kick
Acupressure gives Diancie boosts, even through Protect.
Tyranitar @ Assault Vest
Ability: Sand Stream
EVs: 248 HP / 252 Atk / 8 SpA
Brave Nature
- Rock Slide
- Crunch
- Ice Beam
- Dragon Tail
Tyranitar is a weather (re) setter, obviously. Sandstorm can boost its and Diancie’s SpDef stats, which is why I run a AV set.
And yes, I know my team has flaws. I’m willing to change things. Thank you in advance.
