In viridian city at the poke mart the guy (do not worry he talks to you as soon as you go in )gives you the oak's parcel so go back to pallet town and give it to professor oak.
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catch 80 Pokemon
Yes, but you must have the national pokedex
Provided you have the national Pokedex. Yes.
to get the Pokemon list go to Pokemon.com there click on the pokedex you will find all the Pokemon there
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.