In Pokémon, Bug is weak to three main types: Fire, Flying, and Rock.

Core type weaknesses

When a Bug-type Pokémon is hit by these move types, the damage is super effective:

  • Fire-type moves (like Flamethrower, Fire Blast).
  • Flying-type moves (like Aerial Ace, Brave Bird).
  • Rock-type moves (like Rock Slide, Stone Edge).

Easy way to remember

  • Fire burns bugs (classic “magnifying glass on ants” logic).
  • Flying: birds and other flying creatures often prey on insects.
  • Rock: a rock can crush a bug pretty easily.

Extra notes

  • Bug-type moves themselves are strong against Grass, Psychic, and Dark.
  • Bug-types often pair with other types (like Bug/Flying or Bug/Grass), which can add more weaknesses (for example, Bug/Flying becomes 4× weak to Rock).

TL;DR: Bug is weak to Fire, Flying, and Rock in modern Pokémon games.