Bug-type Pokémon are weak to Fire, Flying, and Rock moves.

Main weaknesses

  • Fire-type moves deal super-effective damage (2×) to Bug Pokémon.
  • Flying-type moves also hit Bug types for 2× damage.
  • Rock-type moves are super-effective as well, making them especially dangerous to Bug/Flying dual types.

Simple matchup table

Here’s a quick look at what Bug types are weak and resistant to in battles:

Against Bug-type| Effect
---|---
Fire moves| Super-effective (2× damage)
Flying moves| Super-effective (2× damage)
Rock moves| Super-effective (2× damage)
Fighting moves| Not very effective (½×)
Grass moves| Not very effective (½×)
Ground moves| Not very effective (½×)

So if you’re facing a Bug-type Pokémon, using strong Fire, Flying, or Rock attacks is usually your best bet, and you should avoid relying on Grass or Fighting moves unless you have no better option. Information gathered from public forums or data available on the internet and portrayed here.