Charizard with wind attack+dragon claw as counter to dragonite?

Ice type does more damage than Dragon type. With your lower hp, killing twice might be a challenge. Perhaps the same as a Gyrados with Dragon Pulse? Less hp and defense but more damage. I think Blastoise will perform better, at least when compared to Gyrados.

I battled with Charizard, My CP was 1775 and took down a 2800 dragonite barely. Maybe with more leveling might be able to take down 2 dragonites. If you do not dodge, do not use charizard.