FYI, this is way harder than Mew, but aye.
Infernape (M) @ Focus Sash
Ability: Iron Fist
Tera Type: Flying
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Fire Punch
- Mach Punch
- Endeavor
- Swords Dance
I still need to test this, but this should be fine on paper. The goal of the set is to lead Infernape and see how your opponents lead. Always go for sword dance unless you think you can OHKO. If the Pokemon is way tanker, you use endeavor to go out with a bang. After SD, you just punch away and hope for the best. I have Tera flying, so if you think the Pokemon will use a ground move, especially if they scarf, it's a free setup.