Xurkitree @ Shuca Berry / Electrium Z / Life Orb
Ability: Beast Boost
EVs: 200 HP / 228 SpA / 80 Spe
Modest Nature
IVs: 0 Atk
- Thunderbolt
- Hidden Power [Ice]
- Tail Glow
- Protect

Outspeeds boosted kommo o in tailwind
252 SpA Life Orb Sheer Force Landorus Earth Power vs. 200 HP / 0 SpD Shuca Berry Xurkitree: 302-356 (84.5 - 99.7%) -- guaranteed 2HKO
If not using Shuca Berry just use 252/252 timid or modest

Xurkitree @ Choice Scarf
Ability: Beast Boost
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Thunderbolt
- Volt Switch
- Hidden Power [Ice]
- Dazzling Gleam / Energy Ball

note this doesnt outspeed boosted kommo o or mega aero