I think I've finally worked out everything about my Gravity team except for natures and EVs.
Marowak;Lightningrod@Thick Club
-Bonemerang
-Rock Slide
-Fire Blast
-Protect
Dusknoir@Leftovers
-Gravity
-Icy Wind
-Imprison
-Protect
Golduck;Damp@Life Orb
-Hydro Pump
-Blizzard
-Focus Blast
-Protect
Clefable;Magic Guard@Toxic Orb
-Gravity
-Safeguard/Helping Hand/Healing Wish
-Sing
-Meteor Mash/Double Edge
Either Golduck or Marowak can open the match, it doesn't matter which. They'll probably use Protect while Dusknoir sets up, then proceed to hammer away with their attacks of choice while Dusknoir slows things down with Icy Wind. Golduck was picked over other Damp pokemon for his speed and special attack, but if he's deemed too fragile, he'll probably get swapped out for either Poliwrath, who is the most durable and gets STAB on Focus Blast, or Politoed, who is more durable and has only slightly less Special Attack.
Clefable's is also support, able to put people to sleep with decent accuracy under Gravity, and can strike with either a recoil-less Double Edge or a 100 percent accurate Meteor Mash. Clefable COULD be swapped out for a Blissey to play Cleric with Healing Bell, since the two both learn Gravity and Sing.
Trick Room isn't really a concern on this team, since at least half the team will thrive under it anyway.
Definitely looks a bit like my Gravity team...save some of the move choices.






