This is the formation team I made up:
Slaking-Huge stats, only impeded by his ability.-Item, toxic orb. the idea is to use him with smeargle and set him free. not many people expect gastro acid on a smeargle.
facade/giga impact-Since truant takes effect, you might as well use Giga impact. If you choose to use smeargle, then go with Facade for sure. GI is only there if you plan on keeping truant.
fire punch-covers more types
punishment/sucker punch/night slash-covers ghost that try to get a facde immunity. Punishment is good fro people who try to boost stats during his truant turn (before you gastro acid him up) Sucker punch is good for peopl who try to make a quick sweep. Night slash is if you don't want all the hypothetical stuff.
Earthquake-covers tons of types.
Zangoose-Item-toxic orb-ability poison rampage
swords dance-insane power squared
Aerial Ace/close combat-covers fighting weakness, close combat deals with rock and steel types that resist normal
night slash-covers ghost types that are immune to facade.
Spore-puts foes to sleep
Gastro acid-devastating effects if used on Slaking.
Endeavor-makes even health to the foe. good when he's weak.
trick room-more trick room
Blissey-gets benefit of trick room, but still can support.
Flamethrower: deals with annoying steel types.
Toxic: stalling win
Stealth Rock: death
thunder wave/protect-impedes anyone instantly, or stall out more with protect
trick room/SIgnal beam- more coverage, or a opportunity for your slow pokemon to attack.
Arceus or Clefable-depending on if you want legendaries or not.
Psychic-covers fighting type
Draco meteor-covers more pokemon
surf/X scissor-covers more pokemon
Follow me/helping hand-follow me is helpful while setting up. HH makes for crazy amounts of damage.
Ice beam/light screen-support or type coverage
Fie blast/safeguard-coverage or support.
Thunderbolt/reflect-even more support or battling.
I was thinking of lickylicky, but the set I had in mind didn't fit the team well.