Just a certificate saying that you completed the pokedex.
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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.
You get trainer stars by completing in-game task. You must complete the Kanto Pokedex, national Pokedex, enter the hall of fame, 200 jumps in the Pokemon Jump, and collected 200 berries in berry picking.
get firered or leafgreen and migrate it to pearl after national pokedex