fire, grass, fighting, poison, psychic and steel I'm pretty sure. if the Pokemon you are battling has another type other than bug (eg poison) than a Pokemon that is effective against both types would be helpful (grass for a bug/poison) i hope this helps.
Fire and flying.
If I understand your question correctly, Dark, Psychic, and Grass are weak against Bug.
Bug, Ghost, and Dark.
Venomoth is a Bug-Poison Pokémon. He's weak against Fire, Pshychic and Rock.
usally fighting and bug (depends if it has a second type)
Okay, so here are all of the types of Pokémon and what they are weak and strong against. Normal - WEAK TO: Fighting STRONG TO: None NO EFFECT: Ghost Fire - WEAK TO: Water, Ground & Rock STRONG TO: Grass, Ice, Bug & Steel Water - WEAK TO: Electric & Grass STRONG TO: Fire, Ground & Rock Electric - WEAK TO: Ground STRONG TO: Water & Flying NO EFFECT: Ground Grass - WEAK TO: Fire, Ice, Poison & Bug STRONG TO: Water, Ground & Rock Ice - WEAK TO: Fire, Fighting, Rock & Steel STRONG TO: Grass, Ground, Flying & Dragon Fighting - WEAK TO: Flying & Psychic STRONG TO: Normal, Ice, Rock, Dark & Steel NO EFFECT: Ghost Poison - WEAK TO: Ground & Psychic STRONG TO: Grass NO EFFECT: Steel Ground - WEAK TO: Water, Grass & Ice STRONG TO: Fire, Electric, Poison, Rock & Steel NO EFFECT: Flying Flying - WEAK TO: Electric, Ice & Rock STRONG TO: Grass, Fighting & Bug Psychic - WEAK TO: Bug, Ghost & Dark STRONG TO: Fighting & Poison NO EFFECT: Dark Bug - WEAK TO: Fire, Flying & Rock STRONG TO: Grass, Psychic & Dark Rock - WEAK TO: Water, Grass, Fighting, Ground & Steel STRONG TO: Fire, Ice, Flying & Bug Ghost - WEAK TO: Ghost & Dark STRONG TO: Psychic & Dark NO EFFECT: Normal Dragon - WEAK TO: Ice, Dragon & Fairy STRONG TO: Dragon Dark - WEAK TO: Fighting & Bug STRONG TO: Psychic & Ghost Steel - WEAK TO: Fire, Fighting & Ground STRONG TO: Ice & Rock Fairy (This is a newly added type in the new game, Pokémon X & Y!) - All we know is that Fairy type is strong against Dragon. Hope this Helps! ;)
If I understand your question correctly, Dark, Psychic, and Grass are weak against Bug.
Bug type Pokemon are weak against Fire, Fighting, and Flying. Not fighting there not weak against fighting types, there weak against Fire, Flying and Rock.
It is weak to fire, flying, and bug.
It's weak to Fighting and Bug attacks.
Dark aNd bug
The Pokemon that are weak to bug Pokemon are Pokemon that are the grass, poison, or psychic type.
The type weak on bug is fight,bug is super effective on dark. Hope this helps
It is weak against Bug type and Fighting type moves....
Fighting and bug.
Bug, Ghost, and Dark.
Because insects eat plants.
they r weak against fire, flying, poison, bug and ice