What is the code to complete the pokedex in Pokemon leaf green?

you'll get a shadow mew

There is no code for Pokemon higher then level 100.It would be unfair in vs battles with other players, and Nintendo didn't make Pokemon higher then level 100.

the mastercode for leaf green is0000BE99 000A 1003DAE6 0007and for the fire red fans the code is000014D1 000A 10044EC8 0007 (both might not work :(soz)note: it is through codebreaker codes and...

go to professor oak when you have at least 60 pokemons that you owned.

if you own a Pokemon lets say magikarp the red areas on the map on the pokedex are where you can find it.