Yes, Dragonite can learn Thunderbolt. It learns it through the use of the Thunderbolt TM, which you can buy at the Celadon Game Corner for 4,000 coins.
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The only way to teach Dragonite Thunderbolt is use TM24
It can't learn that move cause it doesn't exist in leafgreen.
Pikachu Learns ThunderBolt at level 26 (95 Pwr)(15 PP)
Dragonair evolves into Dragonite at level 55.
it does not learn thunderbolt on its own. you must teach it thunderbolt with TM24