You have to have fairly strong and fast Pokemon to defeat him. What is absolutely crucial is a water Pokemon with an ice type move and an electric Pokemon.
His team is comprised of three Dragonites, Charizard, Aerodactyl, and Garydos.
Your best bet to defeat the three Dragonites would be to obtain a water Pokemon and teach it the TM blizzard (which can be obtained in the Goldenrod mall). A Pokemon with a rock type move would be good as well, but some of the Dragonites know Aqua Tail (would easily defeat rock and ground types).
Besides obtaining a water Pokemon with an ice type move, en electric Pokemon is crucial to have. Because they are generally very fast, they will always strike first. An electric Pokemon can easily defeat the three other Pokemon (Garydos extremely easily, Charizard and Aerodactyl easily). A Jolteon, Ampharos, or Raichu would be a great bet, and they can also paralyze the Dragonites to allow slower rock Pokemon to attack with rock slide, rock throw, etc.
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beat the Pokemon luegue then go to the Pokemon centre
nothing
First you have to beat Team Rocket in Mahogany Town and Lance will give you the HM Whirlpool. You also have to beat the Mahogany gym to be able to use it.
Where you beat Brock. An old man is standing in a garden.
after you beat the gym