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 can only get it in the beginning
You have see to many different pokemons. Then you will fill it (you have to every Pokemon to get national pokedex).
in celedon city where the girl gives you tea.
Provided you have the national Pokedex. Yes.
After you fill your whole dex and beat the E4.
look in your pokedex
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.
Squirtle is only obtainable if you chose it at the beginning of the game you must get one from another firered or leafgreen then give it to your firered and then you can finish your pokedex.
in cereilen cave
you can only get it in the beginning
You have to trade with firered or leafgreen to get the national pokedex.
you get your legendery pokedex!!!! you get your legendery pokedex!!!! you get your legendery pokedex!!!!
u could complete the pokedex
You complete your sinnoh pokedex, then go to your hometown and get the national 'dex then go to pal park and migrate pokémon from ruby, sapphire, leafgreen or firered.
To get a cyndaquil u must trade one from Pokemon emerald or Pokemon xd gale of darkness or breed the purified quilava from Pokemon colosseum
You have see to many different pokemons. Then you will fill it (you have to every Pokemon to get national pokedex).