Well mainly it is fire... But it is also ground, and rock. Not steel like the previous person said.
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Water and Grass attacks are super effective against Onix.
Water, Electric, Ice, Rock and Steel moves are super effective against Aerodactyl.
Earth and water Pokemon are good against electric Pokemon.
Water, Ground, Fighting, Steel and Grass-types are all super effective against Rock-type Pokemon.
The first guy has dark Pokemon. Fighting is super effective against dark. The second guy has ghost Pokemon. Psycic is super effective against, but beware: ghost is super effective against psycic. The third guy has ice Pokemon. Fire obviously is super effective against Ice. The last guy has dragon Pokemon. Dragon and ice are super effective against dragon. The champion has water Pokemon, but one of his Pokemon is water and ground. Electric is very good against water, but it doesn't effect his water and ground Pokemon. Grass is very good to use against his water and ground Pokemon.