:SV/Cawmodore:
Cawmodore @ Sitrus Berry
Ability: Volt Absorb
Tera: Stellar
EVs: 252 Atk/ 252 Spe / 4 Def
Adamant Nature
-Belly Drum
-Iron Head
-Acrobatics
-Tera Blast
Cawmodore abuses the fact that Gliscor can't really do anything on turn 1, while (like Chuggalong) Cawmodore itself only needs one turn to superpower itself. Does Glisc Protect to set up Toxic Orb? Belly Drum. Does Glisc try to Knock Off turn 1? Cawmodore out-speeds and eats the berry before Glisc moves. Does Glisc press Swords Dance? Press Belly Drum. It doesn't matter what Gliscor does on turn 1, you are free to click Belly Drum and then OHKO it next turn. Tera Stellar T-Blast is there if you want to predict the Tera, but it really doesn't matter so feel free to replace it with Drain Punch.
Damage Calcs:
+6 252+ Atk Cawmodore Iron Head vs. 244 HP / 36 Def Gliscor: 363-427 (103.1 - 121.3%) -- guaranteed OHKO
+6 252+ Atk Cawmodore Acrobatics (110 BP) vs. 244 HP / 36 Def Gliscor: 498-586 (141.4 - 166.4%) -- guaranteed OHKO
+6 252+ Atk Cawmodore Acrobatics (110 BP) vs. 244 HP / 36 Def Tera Water Gliscor: 498-586 (141.4 - 166.4%) -- guaranteed OHKO
+6 252+ Atk Tera Stellar (First Use) Cawmodore Tera Blast (100 BP) vs. 244 HP / 36 Def Tera Water Gliscor: 724-854 (205.6 - 242.6%) -- guaranteed OHKO
+6 252+ Atk Tera Stellar Cawmodore Acrobatics (110 BP) vs. 244 HP / 36 Def Tera Water Gliscor: 664-782 (188.6 - 222.1%) -- guaranteed OHKO
Tera Water Gliscor Earthquake vs. Cawmodore: 0-0 (0 - 0%) -- possibly the worst move ever
0 Atk Gliscor Knock Off vs. 0 HP / 4 Def Cawmodore: 36-43 (14.9 - 17.8%) -- possible 5HKO
+2 0 Atk Gliscor Knock Off vs. 0 HP / 4 Def Cawmodore: 72-85 (29.8 - 35.2%) -- guaranteed 3HKO (This is after Swords Dance)