Kecleon @ Assault Vest
Ability: Protean
EVs: 252 Atk / 172 HP / 84 Spe
Adamant Nature
- Knock Off
- Drain Punch
- Shadow Sneak
- Sucker Punch
AV Kecleon works as a
check here. I say check because Swanna has access to Scald so a burn on Kec ruins it's plans to beat Swanna. I did notice something nice about the calcs:
252 SpA Swanna Hurricane vs. 172 HP / 0 SpD Assault Vest Kecleon: 78-93 (25.6 - 30.5%) -- guaranteed 4HKO
As you can see, even with Swanna using it's best move, it's a 4HKO (oh yeah, only 70% accurate too!) Scald doesn't do any better.
252 SpA Swanna Supersonic Skystrike (185 BP) vs. 172 HP / 0 SpD Assault Vest Kecleon: 132-156 (43.4 - 51.3%) -- 4.7% chance to 2HKO (This is assuming that Kec sadly comes in on this, only a 1 time use though!)
Kecleon's calcs:
252+ Atk Protean Kecleon Knock Off vs. 0 HP / 0 Def Swanna: 133-157 (45.7 - 53.9%) -- 44.1% chance to 2HKO (If Kecleon can get Swanna on the switch-in and given that Flyinium Z is a non-removable item, a 2HKO is possible here!)
252+ Atk Protean Kecleon Sucker Punch vs. 0 HP / 0 Def Swanna: 144-169 (49.4 - 58%) -- 98.4% chance to 2HKO (Sucker has a better chance here, but Swanna does have Roost so be aware of that)
252+ Atk Protean Kecleon Shadow Sneak vs. 0 HP / 0 Def Swanna: 82-97 (28.1 - 33.3%) -- 0% chance to 3HKO (And of course if Swanna has 1/4 of it's HP left, a Sneak is a guaranteed OHKO!)
So, the risk here is worth the reward I'd say. Drain Punch doesn't help with recovery given Swanna's flying typing but, hopefully it'll never need it! At your own risk here