Here's what I used to reach 50+ and I probably should have used Bulu instead of Koko
Tapu Koko @ Choice Specs
Ability: Electric Surge
EVs: 252 SpA, 252 Spd, 4 Def
Nature: Timid
- Thunderbolt
- Dazzling Gleam
- Hidden Power Ice
- Volt Switch
Mimikyu @ Leftovers
Ability: Disguise
EVs: 252 Atk, 252 Spd, 4 HP
Nature: Adamant
- Swords Dance
- Substitute
- Shadow Sneak
- Play Rough
Toxapex @ Air Balloon
Ability: Regenerator
EVs: 252 HP, 252 Def, 4 SpA
Nature: Bold
- Baneful Bunker
- Scald
- Recover
- Toxic Spikes
Slapping Air Balloon onto Toxapex was probably the best decision I've made. Koko eventually baits out something that'll use Earthquake, usually something that Koko cannot outspeed and OHKO with Thunderbolt once it's locked into it like a Ground-type or Special walls. You will be seeing Wally a lot with this team, and Wally's Scarfchomp WILL use Earthquake, upon which you'd switch off to Air Balloon Toxapex. If it's something like Scarfchomp, it'll have no choice but to switch out. Or, it'll try with a contact move, leaving it open to a Baneful Bunker. If they tried a Fighting, Dragon, or Normal attack and their other strongest attack is Earthquake, switch back and forth between Mimikyu and Tox until they die of Poison or run out of offensive PP. Mimikyu on its own can do a lot, as it can set up a Substitute and/or Swords Dance to either stall or go all out. Just make sure that you only use Play Rough if it's to pick up a quick or last-resort KO or if they're immune/resistant to Ghost enough that a Shadow Sneak won't get them, as that 90% accuracy can be a pain. I got really lucky at times but this setup works better than it should.
