Pokémon that can have the Swarm ability:

No.	Pic	Name	Type	Abilities	Base Stats
					HP	Att	Def	S.Att	S.Def	Spd
#015		Beedrill		Swarm	65	90	40	45	80	75
#123		Scyther		Swarm Technician	70	110	80	55	80	105
#165		Ledyba		Swarm Early Bird	40	20	30	40	80	55
#166		Ledian		Swarm Early Bird	55	35	50	55	110	85
#167		Spinarak		Swarm Insomnia	40	60	40	40	40	30
#168		Ariados		Swarm Insomnia	70	90	70	60	70	40
#212		Scizor		Swarm Technician	70	130	100	55	80	65
#214		Heracross		Swarm Guts	80	125	75	40	95	85
#267		Beautifly		Swarm	60	70	50	100	50	65
#313		Volbeat		Illuminate Swarm	65	73	75	47	85	85
#402		Kricketune		Swarm	77	85	51	55	51	65
#414		Mothim		Swarm	70	94	50	94	50	66
#540		Sewaddle		Swarm Chlorophyll	45	53	70	40	60	42
#542		Leavanny		Swarm Chlorophyll	75	103	80	70	80	92
#543		Venipede		Poison Point Swarm	30	45	59	30	39	57
#544		Whirlipede		Poison Point Swarm	40	55	99	40	79	47
#545		Scolipede		Poison Point Swarm	60	100	89	55	69	112
#588		Karrablast		Swarm Shed Skin	50	75	45	40	45	60
#589		Escavalier		Swarm Shell Armor	70	135	105	60	105	20
#632		Durant		Swarm Hustle	58	109	112	48	48	109
#736		Grubbin		Swarm	47	62	45	55	45	46
#824		Blipbug		Swarm Compoundeyes	25	20	20	25	45	45
#825		Dottler		Swarm Compoundeyes	50	35	80	50	90	30
#826		Orbeetle		Swarm Frisk	60	45	110	80	120	90
#826		Orbeetle		Swarm Frisk Telepathy	60	45	110	80	120	90

Pokémon that can have the Swarm ability as their Hidden Ability:

No.	Pic	Name	Type	Abilities	Base Stats
					HP	Att	Def	S.Att	S.Def	Spd
#595		Joltik		Compoundeyes Unnerve	50	47	50	57	50	65
#596		Galvantula		Compoundeyes Unnerve	70	77	60	97	60	108
#636		Larvesta		Flame Body	55	85	55	50	55	60
#637		Volcarona		Flame Body	85	60	65	135	105	100
#736		Grubbin		Swarm	47	62	45	55	45	46