You level it up to lvl 36.
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Buy a Dratini from the Game Corner's Prizes, then get it to level 30, when it will evolve into Dragonair. Get your new Dragonair to level 50 and it will evolve into Dragonite.
Trade dratini from firered or leafgreen to ruby.
trade from leafgreen or fireredYou can only get it by trade
You can't evolve Yanma in Leafgreen. This is because Leafgreen was made before Yanmega was made. So basically in Leafgreen, Yanma is a Pokemon that can't evolve.
Dratini evolves at level 30 into Dragonite.