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.
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dragonite 'cause its way rarer.
No Dragonite is not a legendary, but it is a pseudo-legendary.
Dragonite is a dragon / flying type Pokemon.
Dragonite is not a legendary Pokemon only because it evolves. The dragonite evolves for a dratinti, then to a dragonair,and finally it evolves in to a dragonite. I hope that this can come in handy for every one else as it did for me.
Dratini evolves into Dragonair at level 30, Dragonair into Dragonite at level 55, and Dragonite doesn't evolve.