252 SpA Life Orb Gengar Sludge Wave vs. 0 HP / 4 SpD Assault Vest Raikou: 134-160 (41.7 - 49.8%) -- guaranteed 3HKO
252 SpA Raikou Shadow Ball vs. 0 HP / 4 SpD Gengar: 204-240 (78.7 - 92.6%) -- guaranteed 2HKO
0- Atk Tornadus-T Knock Off (97.5 BP) vs. 0 HP / 0 Def Raikou: 79-94 (24.6 - 29.2%) -- 99.9% chance to 4HKO
252 SpA Raikou Thunderbolt vs. 132 HP / 0 SpD Assault Vest Tornadus-T: 198-234 (59.6 - 70.4%) -- guaranteed 2HKO
252 Atk Tough Claws Mega Metagross Zen Headbutt vs. 0 HP / 0 Def Raikou: 238-282 (74.1 - 87.8%) -- guaranteed 2HKO
252 SpA Raikou Shadow Ball vs. 0 HP / 4 SpD Mega Metagross: 148-176 (49.1 - 58.4%) -- 97.7% chance to 2HKO
Kinda risky, but if Mega Metagross has prior damage, Raikou can outspeed and 2HKO it.
0+ Atk Choice Band Talonflame Flare Blitz vs. 0 HP / 0 Def Raikou: 226-267 (70.4 - 83.1%) -- guaranteed 2HKO
252 SpA Raikou Thunderbolt vs. 248 HP / 200 SpD Talonflame: 288-338 (80.2 - 94.1%) -- guaranteed 2HKO
252 Atk Mega Pinsir Close Combat vs. 0 HP / 0 Def Raikou: 189-223 (58.8 - 69.4%) -- guaranteed 2HKO
252 SpA Raikou Thunderbolt vs. 0 HP / 4 SpD Mega Pinsir: 294-348 (108.4 - 128.4%) -- guaranteed OHKO
0 SpA Slowbro Psyshock vs. 0 HP / 0 Def Raikou: 109-130 (33.9 - 40.4%) -- guaranteed 3HKO
252 SpA Raikou Thunderbolt vs. 252 HP / 24 SpD Slowbro: 318-374 (80.7 - 94.9%) -- guaranteed 2HKO after Leftovers recovery