Voting
The Chansey can't really do anything to Kyurem and gets punished for clicking half it's moveset vs Mega Diancie thanks to Magic Bounce.
The Zeraora needs a work up to break the core which is a bit worse than the rest
The Medicham is really solid, but Bullet Punch MMedi feels way worse for more general teams with bulky waters and the like, Medicham also underspeeds Magnezone here so with chip it can be taken out by said Zone, or just die if Crit.
The Urshifu is pretty solid, but has a 50/50 if faced with Diancie with the rest alive, since Surging does basically nothing to Kyurem, and CC can't OHKO Diancie, being a roll vs Mega Diancie when Jolly. Running Adamant scarf loses out on outpacing things like +1 Kyurem, Lele and Swift Swim Swampert. But Jolly also has poor damage output compared to banded sets or adamant, so it feels a bit bad either way.
The Aerodactyl seems the most solid, Adamant can outspeed all and is punished only by x2 SEdge miss or a miss and low roll. Jolly has more chances to be punished. Adamant means under pacing the likes of +1 Gyarados, +1 Blaziken, Slush Rush Arctozolt, Zeraora and Mega Lopunny, which you really want to be outpacing. Diancie needs to mega to OHKO Aero though, and that makes it a pretty favourable roll, but a less favourable roll on Kyurem.
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Submitting Volcarona
Volcarona (F) @ Buginium Z
Ability: Flame Body
EVs: 200 HP / 184 Def / 124 Spe
Timid Nature
IVs: 0 Atk
- Quiver Dance
- Flamethrower
- Bug Buzz
- Roost
Volcarona can basically eat the core alive alone. After 1 QD it OHKO's the entire core alone, outspeeding everything, and can set up on everything outside of unfavourable RNG.
252+ SpA Tapu Lele Psyshock vs. 200 HP / 184 Def Volcarona in Psychic Terrain: 208-246 (57.6 - 68.1%) -- not a KO
Lele can't OHKO with a Psyshock and Volcarona sets up a QD on it.
+1 0 SpA Volcarona Savage Spin-Out (175 BP) vs. 0 HP / 0 SpD Tapu Lele: 324-382 (115.3 - 135.9%) -- guaranteed OHKO
+1 SpA Bug Buzz then OHKO's Lele 100% of the time.
While Lele can taunt Volcarona, standard Offensive Volcarona sets will outpace Lele and set up a QD ahead of the taunt, so Lele is generally discouraged from clicking it as if they taunt vs offensive volcarona, they often lose out to it bar a high roll, vs double psyshock almost always beating offensive volcarona sets.
252 Atk Protean Greninja Gunk Shot vs. 200 HP / 184 Def Volcarona: 177-208 (49 - 57.6%) -- 95.7% chance to 2HKO
Greninja also can't OHKO with a Gunk Shot even through Protean
+1 0 SpA Volcarona Flamethrower vs. 0 HP / 0- SpD Greninja: 277-327 (97.1 - 114.7%) -- 81.3% chance to OHKO
+1 Flamethrower then has a good chance to OHKO in return.
+1 0 SpA Volcarona Bug Buzz vs. 0 HP / 0- SpD Greninja: 554-654 (194.3 - 229.4%) -- guaranteed OHKO
+1 Bug Buzz always KO's if it swaps in off the back of Mawile or Lele KO.
252+ Atk Mawile-Mega Knock Off vs. 200 HP / 184 Def Volcarona: 75-89 (20.7 - 24.6%) -- guaranteed 5HKO
252+ Atk Mawile-Mega Play Rough vs. 200 HP / 184 Def Volcarona: 77-91 (21.3 - 25.2%) -- 0.1% chance to 4HKO
252+ Atk Mawile-Mega Sucker Punch vs. 200 HP / 184 Def Volcarona: 81-96 (22.4 - 26.5%) -- 24.8% chance to 4HKO
Mawile does nothing neutrally vs Volcarona, especially thanks to Z reducing Knock Off's damage.
+2 252+ Atk Mawile-Mega Sucker Punch vs. 200 HP / 184 Def Volcarona: 161-190 (44.5 - 52.6%) -- 22.3% chance to 2HKO
+2 Sucker doesn't hurt much either so you can QD on Mawile.
+1 0 SpA Volcarona Flamethrower vs. 92 HP / 0 SpD Mawile-Mega: 392-464 (148.4 - 175.7%) -- guaranteed OHKO
+1 Flamethrower then drops Mega Mawile.
252+ Atk Mawile-Mega Sucker Punch vs. 200 HP / 184 Def Volcarona: 81-96 (22.4 - 26.5%) -- guaranteed 2HKO
Even in a world where Lele Psyshock's to chunk Volc and Mawile comes in and can use Sucker, it doesn't get a KO.