Pokémon/Pokédex/Types/Bug

There are 36 Bug Pokémon. Of these, 12 are first generation, 10 are second generation and 14 are third generation.

Of the 36 Bug Pokémon, only 9 are pure Bug. The other 27 are Flying(8), Poison(8), Rock(3), Grass(2), Steel(2), Fighting(1), Ground(1), Ghost(1) and Water(1).

First generation type matching of Bug Pokémon


Name	Other type	Effected by moves of type
Name	Other type	Normal	Fire	Water	Electric	Grass	Ice	Fighting	Poison	Ground	Flying	Psychic	Bug	Rock	Ghost	Dragon
Pure type			X2			/2		/2	X2	/2	X2			X2
Beedrill	Poison					/4		/4	X1	X1		X2	X2
Butterfree	Flying				X2	/4	X2	/4		0			/2	X4
Caterpie
Kakuna	Poison					/4		/4	X1	X1		X2	X2
Metapod
Paras	Grass		X4	/2	/2	/4	X2		X4	/4	X4		X2
Parasect	Grass		X4	/2	/2	/4	X2		X4	/4	X4		X2
Pinsir
Scyther	Flying				X2	/4	X2	/4		0			/2	X4
Venomoth	Poison					/4		/4	X1	X1		X2	X2
Venonat	Poison					/4		/4	X1	X1		X2	X2
Weedle	Poison					/4		/4	X1	X1		X2	X2

Notes

Metapod gains a type (Flying) when evolves into Butterfree.
Bug type isn't resistant to itself.

Changes in Type Matching from first generation to second

Poison moves on Bug: X1

Second/Third Generation type matching of Bug Pokémon


Name	Other type	Effected by moves of type																	Physical def. / Special def.
Name	Other type	Normal	Fire	Water	Electric	Grass	Ice	Fighting	Poison	Ground	Flying	Psychic	Bug	Rock	Ghost	Dragon	Dark	Steel	Physical def. / Special def.
Pure type			X2			/2		/2		/2	X2			X2
Anorith	Rock	/2	X1	X2		X1		X1	/2	X1	X1							X2	1:1
Ariados	Poison					/4		/4	/2	X1		X2	/2						7:6
Armaldo	Rock	/2	X1	X2		X1		X1	/2	X1	X1							X2	5:4
Beautifly	Flying				X2	/4	X2	/4		0			/2	X4					1:1
Beedrill	Poison					/4		/4	/2	X1		X2	/2						1:2
Butterfree	Flying				X2	/4	X2	/4		0			/2	X4					5:8
Cascoon																			9:4
Caterpie																			7:4
Dustox	Poison					/4		/4	/2	X1		X2	/2						7:9
Forretress	Steel	/2	X4			/4	/2	X1	0	X1	X1	/2	/2	X1	/2	/2	/2	/2	7:3
Heracross	Fighting										X4	X2	/2	X1			/2		4:5
Illumise																			3:4
Kakuna	Poison					/4		/4	/2	X1		X2	/2						2:1
Ledian	Flying				X2	/4	X2	/4		0			/2	X4					4:9
Ledyba	Flying				X2	/4	X2	/4		0			/2	X4					3:8
Masquerain	Flying				X2	/4	X2	/4		0			/2	X4					3:4
Metapod																			9:4
Nincada	Ground			X2	0	X1	X2		/2					X1					3:1
Ninjask	Flying				X2	/4	X2	/4		0			/2	X4					9:10
Paras	Grass		X4	/2	/2	/4	X2		X2	/4	X4		X2						1:1
Parasect	Grass		X4	/2	/2	/4	X2		X2	/4	X4		X2						1:1
Pineco																			5:2
Pinsir																			10:7
Scizor	Steel	/2	X4			/4	/2	X1	0	X1	X1	/2	/2	X1	/2	/2	/2	/2	5:4
Scyther	Flying				X2	/4	X2	/4		0			/2	X4					1:1
Shedinja	Ghost	0						0	/2				/2		X2		X2		3:2
Shuckle	Rock	/2	X1	X2		X1		X1	/2	X1	X1							X2	1:1
Silcoon																			9:4
Spinarak	Poison					/4		/4	/2	X1		X2	/2						1:1
Surskit	Water		X1	/2	X2	X1												/2	5:8
Venomoth	Poison					/4		/4	/2	X1		X2	/2						4:5
Venonat	Poison					/4		/4	/2	X1		X2	/2						9:10
Volbeat																			3:4
Weedle	Poison					/4		/4	/2	X1		X2	/2						3:2
Wurmple																			7:6
Yanma	Flying				X2	/4	X2	/4		0			/2	X4					1:1

Notes

This table ignores special abilities.
Some Pokémon gain a new type when they evolve. If they already have 2 types, they will loose one.
Forretress and Scizor are only weak to Fire type. This weakness is double weakness.
Cascoon, Forretress, Metapod, Nincada, Pineco and Silcoon have a physical/special defence ratio of over 2; this means that a special move is better than a physical move for which the type matching says is twice as good.
Ledian have a physical/special defence ratio of under 1/2; this means that a physical move is better than a special move for which the type matching says is twice as good.