Ther is some Pokemon like magmar, pincir and sandslash that you can't catch in Pokemon fire red, you must trade them from another game.
It is Impossible unless you have some type of hack.
People gve an everstone to you as a gift,on some occasions.
some fire Pokemon, vulpix or just look in your game and don't be lazy.Also in diamond once you entered firered in the slot migrate your Pokemon if the regions kanto or hoenn then enter pal park in diamond and you'll get to enter a show then you will be able to catch Pokemon from firered there.
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He is secretly green.
Because there's water in celadon city if you use fishing rods in the water you can actually find pokemon!
He has no true name but some people call him Red, like Pokemon Red or Firered like Pokemon Firered.
graveler haunter an some others some holding items some not
poliwhirl, evee and some others
some items are used during pokemon trading.
you get them from Paris in the safari zone.
I think it is, but that's just because I don't care if I have a sandshrew or not. Some Pokemon are only available on firered and some on leafgreen; it just depends on which Pokemon you are willing to do without until you can trade for what you need.