Keep playing the game, and if you are satisfied with hitmonlee, use it when appropriate.
After you beat Giovanni in Viridian City, you can get the macho brace by using your itemfinder around the spot where you battled him. It promotes attack, but lowers speed when leveling a pokemon. Perfect for Hitmonlee in my opinion.
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Saffron City
you can get it if you defeat the fighting gym leader in saffron city but you can only get 1
The Karate building in Saffron City, the Master there will give you the option of letting you choose between Hitmonchan and Hitmonlee. They will both be male so you will need to put 1 of them into the Breeding Center on Four Island with a Ditto and the Pok
You have to beat team rocket in Silph Co
you have to go too Fushia City beat the gym leader then they will let you in Saffron City then go in to Silph Co. and get to the last floor find Giovanni battle Giovanni then then get out of Silph Co. and you can go in the Saffron gym.