How do you kill dragonite?

You obviously need a very strong Pokemon that can stand up against a dragonite, especially a trained one. Dragons are already hard to kill, but a Dragonite can learn many different types of moves like Ice Beam, Thunderbolt, Earthquake and so on. The best would probably be a strong Ice type that can take hits but still use Ice Beam or Blizzard, since Dragonite is Dragon/Flying, both are very weak to Ice.