When does dragonair evolve into Dragonite in Pokemon leaf green?

dragonair evolves at level55 into dragonite bonus information... if u put a gyrados and dratini dragonair or dragonite at the day care at island 4 u get a dratini egg also u get mewtwo at the cerulan cave once u defeated the Pokemon league and get the ruby and sapphire stone to celio. to get ruby its at mount ember where the rockets are and sapphire is in six island at braille cave use cut to enter once u go to get it a scientist will steal it and try to sell it to team rocket. he willl tell u the second passWord to get inside the warehouse on island five first u get at mount ember first is goldeen need log and the second is yes nah chansey.
Dragonair will evolve at level 55.