Type chart

Type chart is the most important tool because shows which modifiers are applied to move types when attacking Pokémon of each type.

Represent

Overall

Multi-type

1) When Psychic-type move------>Ground & Steel-type Pokémon

Psychic------>Ground=1

Psychic------>Steel=0.5

1×0.5=0.5, Not very effective.

2) When Fire-type move------>Grass & Rock-type Pokémon

Fire------>Grass=2

Fire------>Rock=0.5

2×0.5=1, Still OK.

3) When Fighting-type move------>Ghost & Ice-type Pokémon

Fighting------>Ghost=0

Fighting------>Ice=2

0×2=0, Doesn't affect...

4) When Ground------>Fire & Steel-type Pokémon

Ground------>Fire=2

Ground------>Steel=2

2×2=4, Super effective!