Answer 1

There are 151 Pokemon if FireRed/LeafGreen in the Native Pokedex, though National contains Pokemon from the Hoenn and Johto regions, increasing the total to 386.

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Source: http://Pokemondb.net/pokedex/game/firered-leafgreen
Darkgoku: http://serebii.net/red_green/Pokemon.shtml

Comments

You copied DG....not cool...

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One of the answers will probably get hidden, so since Darkgoku mentioned me, I mention him, so both the links are there.

Answer 2

As fizzcube said the pokedex contains 151 Pokemon but if you look at the website I have entered in my comment you can see the Pokemon which are avaliable to be catched from other regions as well!!

Hope this helps!!

Comments

Your link does not exist... O_o

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Okay as you can see the website http://serebii.net/red_green/pokemon.shtml the P in pokemon should be small but i have entered it as a large" p."

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LOL, I forgot he was talking about FR for half a sec. Thought he asked about Red, LOL.
I hate links sometimes. They can be so stubborn :(