...? umm this question doesnt make sense. you do it by seeing Pokemon! all the Pokemon in the game! (no trade)
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You finish the Pokemon league and get the national pokedex You finish the Pokemon league and get the national pokedex
Just a certificate saying that you completed the pokedex.
if you own a Pokemon lets say magikarp the red areas on the map on the pokedex are where you can find it.
get all the Pokemon in the pokedex then talk to birch
Firered and leafgreen both can catch different Pokemon but there pokedex is the same, here is some examples: magmar only in leafgreen not firered, oddish in firered not leafgreen, ekans in firered not leafgreen, bellsprout in leafgreen not firered, pinsir in leafgreen not firered.