[Demonskid]

Charizard is considered a dragon.

Charizard is a very dragon-like Pokémon.
http://bulbapedia.bulbagarden.net/wi...ok%C3%A9mon%29

-w- his offical types are fire/flying but he is considered a dragon. That and they had him in the dragon fronteir decks of the cards which consisted of all pokemon considered dragons.

and for Gyarados .. straight from bulbapedia

Gyarados is a large dragon Pokémon, resembling dragons seen in Chinese mythology.
http://bulbapedia.bulbagarden.net/wi...ok%C3%A9mon%29

Just because their types are this and this doesn't make them non dragons

More Proof

Dragon Master Lance's Pokemon

http://bulbapedia.bulbagarden.net/wi...os_%28VS_98%29
http://bulbapedia.bulbagarden.net/wi...rd_%28VS_97%29