Swarm

When Pokémon with this ability are at 1/3 HP or less, all of their Bug moves will have 50% more power.

When a Pokémon with this ability is first in the party, wild Pokémon cries in the area are heard more often while walking.

Pokémon	Tier	Abilities	HP	Atk	Def	SpA	SpD	Spe
Ariados	NU	Insomnia / Swarm	70	90	70	60	60	40
Beautifly	NU	Swarm	60	70	50	90	50	65
Beedrill	NU	Swarm	65	80	40	45	80	75
Heracross	OU	Guts / Swarm	80	125	75	40	95	85
Ledian	NU	Early Bird / Swarm	55	35	50	55	110	85
Scizor	BL	Swarm	70	130	100	55	80	65
Scyther	UU	Swarm	70	110	80	55	80	105
Volbeat	NU	Illuminate / Swarm	65	73	55	47	75	85