Since Pronoob didn't actually make the post in time I'd just like to put zeraora up because it would be a crime not to.
Zeraora @ Heavy-Duty Boots
Ability: Volt Absorb
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Plasma Fists
- Close Combat
- Knock Off
- Bulk Up / Volt Switch
Zeraora. It has favorable odds to OHKO volcanion after rocks and a guaranteed one-shot vs weavile. Volt switch makes this matchup even more favorable for its ability to get free chip damage on volcanion, putting it in range of plasma fists. Bulk up can also work if it gets in on weavile, enabling it to sponge weavile's attacks before OHKOing both. Great mon, great matchup, knocks lando, end of story.