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Beedrill @ Beedrillite
Ability: Swarm
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Protect
- U-turn
- Poison Jab
- Knock Off / Drill Run
Beedrill can switch into any of Serperior's moves (with the exception of Hidden Power) and mega evolve. After mega evolving, Beedrill's ability and high attack stat allow it to OHKO Serperior with both of its STAB moves.
However, if Serperior has acquired boosts, Beedrill loses many switch-in opportunities. At +2, it can no longer switch in to Dragon Pulse, and Hidden Power is a guaranteed OHKO, and if it gets any more than that, then Beedrill can only switch into Giga Drain.

Beedrill @ Beedrillite
Ability: Swarm
EVs: 252 Atk / 4 Def / 252 Spe
Jolly Nature
- Protect
- U-turn
- Poison Jab
- Knock Off / Drill Run
Beedrill can switch into any of Serperior's moves (with the exception of Hidden Power) and mega evolve. After mega evolving, Beedrill's ability and high attack stat allow it to OHKO Serperior with both of its STAB moves.
However, if Serperior has acquired boosts, Beedrill loses many switch-in opportunities. At +2, it can no longer switch in to Dragon Pulse, and Hidden Power is a guaranteed OHKO, and if it gets any more than that, then Beedrill can only switch into Giga Drain.
Offensive:
252 Atk Adaptability Mega Beedrill U-turn vs. 0 HP / 0 Def Serperior: 356-420 (122.3 - 144.3%) -- guaranteed OHKO
252 Atk Adaptability Mega Beedrill Poison Jab vs. 0 HP / 0 Def Serperior: 408-480 (140.2 - 164.9%) -- guaranteed OHKO
252 Atk Mega Beedrill Knock Off (97.5 BP) vs. 0 HP / 0 Def Serperior: 123-145 (42.2 - 49.8%) -- guaranteed 3HKO
252 Atk Mega Beedrill Drill Run vs. 0 HP / 0 Def Serperior: 51-60 (17.5 - 20.6%) -- possible 5HKO
Defensive:
252 SpA Life Orb Serperior Leaf Storm vs. 0 HP / 0 SpD Mega Beedrill: 57-68 (21 - 25%) -- 0% chance to 4HKO
+2 252 SpA Life Orb Serperior Leaf Storm vs. 0 HP / 0 SpD Mega Beedrill: 114-135 (42 - 49.8%) -- guaranteed 3HKO
+4 252 SpA Life Orb Serperior Leaf Storm vs. 0 HP / 0 SpD Mega Beedrill: 173-203 (63.8 - 74.9%) -- guaranteed 2HKO
+6 252 SpA Life Orb Serperior Leaf Storm vs. 0 HP / 0 SpD Mega Beedrill: 230-270 (84.8 - 99.6%) -- guaranteed 2HKO
252 SpA Life Orb Serperior Dragon Pulse vs. 0 HP / 0 SpD Mega Beedrill: 101-120 (37.2 - 44.2%) -- guaranteed 3HKO
+2 252 SpA Life Orb Serperior Dragon Pulse vs. 0 HP / 0 SpD Mega Beedrill: 201-238 (74.1 - 87.8%) -- guaranteed 2HKO
+4 252 SpA Life Orb Serperior Dragon Pulse vs. 0 HP / 0 SpD Mega Beedrill: 302-356 (111.4 - 131.3%) -- guaranteed OHKO
252 SpA Life Orb Serperior Hidden Power Fire vs. 0 HP / 0 SpD Mega Beedrill: 146-172 (53.8 - 63.4%) -- guaranteed 2HKO
+2 252 SpA Life Orb Serperior Hidden Power Fire vs. 0 HP / 0 SpD Mega Beedrill: 286-338 (105.5 - 124.7%) -- guaranteed OHKO
252 SpA Life Orb Serperior Giga Drain vs. 0 HP / 0 SpD Mega Beedrill: 32-39 (11.8 - 14.3%) -- possible 7HKO
+6 252 SpA Life Orb Serperior Giga Drain vs. 0 HP / 0 SpD Mega Beedrill: 133-156 (49 - 57.5%) -- 96.9% chance to 2HKO
252 Atk Adaptability Mega Beedrill U-turn vs. 0 HP / 0 Def Serperior: 356-420 (122.3 - 144.3%) -- guaranteed OHKO
252 Atk Adaptability Mega Beedrill Poison Jab vs. 0 HP / 0 Def Serperior: 408-480 (140.2 - 164.9%) -- guaranteed OHKO
252 Atk Mega Beedrill Knock Off (97.5 BP) vs. 0 HP / 0 Def Serperior: 123-145 (42.2 - 49.8%) -- guaranteed 3HKO
252 Atk Mega Beedrill Drill Run vs. 0 HP / 0 Def Serperior: 51-60 (17.5 - 20.6%) -- possible 5HKO
Defensive:
252 SpA Life Orb Serperior Leaf Storm vs. 0 HP / 0 SpD Mega Beedrill: 57-68 (21 - 25%) -- 0% chance to 4HKO
+2 252 SpA Life Orb Serperior Leaf Storm vs. 0 HP / 0 SpD Mega Beedrill: 114-135 (42 - 49.8%) -- guaranteed 3HKO
+4 252 SpA Life Orb Serperior Leaf Storm vs. 0 HP / 0 SpD Mega Beedrill: 173-203 (63.8 - 74.9%) -- guaranteed 2HKO
+6 252 SpA Life Orb Serperior Leaf Storm vs. 0 HP / 0 SpD Mega Beedrill: 230-270 (84.8 - 99.6%) -- guaranteed 2HKO
252 SpA Life Orb Serperior Dragon Pulse vs. 0 HP / 0 SpD Mega Beedrill: 101-120 (37.2 - 44.2%) -- guaranteed 3HKO
+2 252 SpA Life Orb Serperior Dragon Pulse vs. 0 HP / 0 SpD Mega Beedrill: 201-238 (74.1 - 87.8%) -- guaranteed 2HKO
+4 252 SpA Life Orb Serperior Dragon Pulse vs. 0 HP / 0 SpD Mega Beedrill: 302-356 (111.4 - 131.3%) -- guaranteed OHKO
252 SpA Life Orb Serperior Hidden Power Fire vs. 0 HP / 0 SpD Mega Beedrill: 146-172 (53.8 - 63.4%) -- guaranteed 2HKO
+2 252 SpA Life Orb Serperior Hidden Power Fire vs. 0 HP / 0 SpD Mega Beedrill: 286-338 (105.5 - 124.7%) -- guaranteed OHKO
252 SpA Life Orb Serperior Giga Drain vs. 0 HP / 0 SpD Mega Beedrill: 32-39 (11.8 - 14.3%) -- possible 7HKO
+6 252 SpA Life Orb Serperior Giga Drain vs. 0 HP / 0 SpD Mega Beedrill: 133-156 (49 - 57.5%) -- 96.9% chance to 2HKO
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