Dragon Pokemon are weak to ice and dragon type moves, and resistant to electric, fire, grass, and water type moves (By resistant I mean that when those type moves hit a dragon Pokemon, they will only do half the damage that they normally would).
(This answer only applies to pure dragon Pokemon. Extra types such as flying/dragon, will have more weaknesses and strengths.)
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Unfortunately, fighting Pokemon are not super-effective against dragon-type Pokemon. However, if the fighting-type (move or Pokemon) is strong enough, it can still do substantial damage against a dragon-type Pokemon.
Dragon type Pokemon are weak against Ice, Dragon, and Fairy type moves.
Dragon-type moves are super effective against Dragon-type Pokemon.
Dragon type is good to Dragon type. I think it is more like water or grass. I am no sure Ice?! Im not the guy above: Dragon and Ice are super effective against Dragon type Pokemon
Dragon type moves are only super effective against Dragon type Pokemon.