Type matchups are a fundamental aspect of Pokémon battles, determining the effectiveness of attacks. Understanding which types are strong against others can give you a significant advantage. The following chart outlines the basic type effectiveness in Pokémon Colosseum:
| Attacking Type | Super Effective Against | Not Very Effective Against | Immune To |
|---|---|---|---|
| Normal | - | Rock, Steel | Ghost |
| Fire | Grass, Ice, Bug, Steel | Fire, Water, Rock, Dragon | - |
| Water | Fire, Ground, Rock | Water, Grass, Dragon | - |
| Electric | Water, Flying | Electric, Grass, Dragon | Ground |
| Grass | Water, Ground, Rock | Fire, Grass, Poison, Flying, Bug, Dragon, Steel | - |
| Ice | Grass, Ground, Flying, Dragon | Fire, Ice, Water, Steel | - |
| Fighting | Normal, Ice, Rock, Dark | Poison, Flying, Psychic, Bug, Fairy | - |
| Poison | Grass, Fairy | Poison, Ground, Rock, Ghost | - |
| Ground | Electric, Fire, Poison, Rock, Steel | Grass, Bug | Flying |
| Flying | Grass, Fighting, Bug | Electric, Rock, Steel | - |
| Psychic | Fighting, Poison | Psychic, Steel | Dark |
| Bug | Grass, Psychic, Dark | Fire, Fighting, Poison, Flying, Ghost, Steel, Fairy | - |
| Rock | Fire, Ice, Flying, Bug | Fighting, Ground, Steel | - |
| Ghost | Psychic, Ghost | Dark | Normal, Fighting |
| Dragon | Dragon | Steel | - |
| Dark | Psychic, Ghost | Fighting, Bug, Fairy | - |
| Steel | Rock, Ice, Fairy | Fire, Water, Electric, Steel | - |
| Fairy | Fighting, Dragon, Dark | Fire, Poison, Steel | Dragon |
Remember that this chart applies to both offensive and defensive matchups. A Fire-type attack is super effective against a Grass-type Pokémon, and conversely, a Fire-type Pokémon takes super effective damage from Water-type attacks.