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I got to 52 in singles with Koko/Celesteela/Mega Garchomp
I got to 86 in doubles with Oranguru/Hariyama/Marowak/Lurantis
strategy with singles is to just sweep as much with Koko's Thunderbolt/Dazzling Gleam/HP Ice, Volt Switch out if there is trouble to Celesteela since Celesteela is immune to both of Koko's weaknesses. Celesteela is the typical defensive Leech Seed/Protect/Heavy Slam/Flamethrower set. Garchomp is just there as backup to cover Celesteela's Electric and Fire weaknesses.
strategy in doubles is to Trick Room turn 1 with Oranguru and Fake Out with Hariyama to protect the team while Flame Orb and Trick Room activate. Then just take out as many threats as possible with Hariyama Close Combat/Knock Off/Rock Slide with Oranguru Instructing everything to hit twice. Marowak and Lurantis are also there as backup since they work well in Trick Room and hit hard with Thick Bone and Contrary Leaf Storm. All running negative speed natures with HP EVs for extra bulk.