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Pokemon Heart Gold and Soul Silver: Type Chart
This chart shows weakness and resistance of every Pokemon type. The type on the left is the attacking move's type. The type on the top is the defending Pokemon type. For a specific Pokemon's weaknesses and resistances, check out the Heart Gold and Soul Silver Pokedex.

0-Attack doesn't effect the defending Pokemon.
½-Attack does half damage.
2-Attack does two times the damage.

NOR FIR WAT ELE GRA ICE FIG POI GRO FLY PSY BUG ROC GHO DRA DAR STE
NORMAL ½ 0 ½
FIRE ½ ½ 2 2 2 ½ ½ 2
WATER 2 ½ ½ 2 2 ½
ELECTRIC 2 ½ ½ 0 2 ½
GRASS ½ 2 ½ ½ 2 ½ ½ 2 ½ ½
ICE ½ ½ 2 ½ 2 2 2 ½
FIGHTING 2 2 ½ ½ ½ ½ 2 0 2 2
POISON 2 ½ ½ ½ ½ 0
GROUND 2 2 ½ 2 0 ½ 2 2
FLYING ½ 2 2 2 ½ ½
PSYCHIC 2 2 ½ 0 ½
BUG ½ 2 ½ ½ ½ 2 ½ 2 ½
ROCK 2 2 ½ ½ 2 2 ½
GHOST 0 2 2 ½ ½
DRAGON 2 ½
DARK ½ 2 2 ½ ½
STEEL ½ ½ ½ 2 2 ½