you cant theres only 16. last leader is Blue
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Go to the forth gym!
go to the radio tower in Goldenrod city, team rocket will be there and you have to defeat them.
It is attainable in poke mart after the 3 gym badge (i think)
In one of the gyms. I don't know witch one.
dragon denyou can find dratini by surfing in dragon's den in blackthorn city. (the city where you get the eighth gym badge)