Bikutini@Life Orb (252 EVs, +Nature) V-Generate vs Rotom-W@Leftovers (252/252 EVs, +Nature): 65.9 ~ 77.6% (180 ~ 212 HP) (Sunshine)
Bikutini@Life Orb (252 EVs, +Nature) V-Generate vs Skarmory@Leftovers (252/252 EVs, +Nature): 66 ~ 77.8% (200 ~ 236 HP) (Rain) Only under rain can you take it.
Bikutini@Life Orb (252 EVs, +Nature) V-Generate vs Nattorei@Leftovers (252/252 EVs, +Nature): 130.8 ~ 154.5% (420 ~ 496 HP) (Rain) Obviously dead.
Bikutini@Life Orb (252 EVs, +Nature) V-Generate vs Lugia@Leftovers (Multi-Scale) (252/252 EVs, +Nature): 40.5 ~ 47.5% (156 ~ 183 HP) (Sunshine)
After SR, however:
Bikutini@Life Orb (252 EVs, +Nature) V-Generate vs Lugia@Leftovers (252/252 EVs, +Nature): 81 ~ 95.3% (312 ~ 367 HP) (Sunshine)
95% chance to OHKO after SR, factoring in miss chance.
Bikutini@Life Orb (252 EVs, +Nature) V-Generate vs Kyogre (4/0 EVs, Neutral Nature): 30.5 ~ 36% (95 ~ 112 HP) (Rain) Unsurprisingly can take the hit.
Don't feel like doing anymore, so I leave you with:
Bikutini@Life Orb (252 EVs, +Nature) V-Generate vs Paras@Leftovers (4/0 EVs, Neutral Nature): 2333.7 ~ 2746.9% (4224 ~ 4972 HP) (Sunshine)
*EDIT* Two more:
Bikutini@Life Orb (252 EVs, +Nature) V-Generate vs Wobbuffet@Leftovers (252/252 EVs, +Nature): 94.9-111.7% (525-618 HP) (Sunshine) 65% chance to OHKO without SR.
Bikutini@Life Orb (252 EVs, +Nature) V-Generate vs Porygon2@Evolution Stone (252/252 EVs, +Nature): 79-93% (271-319 HP) (Sunshine)