Both Mew and MewTwo are available in Leaf Green and Fire Red, and are obviously very powerful and rare (MewTwo is caught at Level 70!), but I personally find any levelled Pokemon is just as good.
i'd say MewTwo or the starting Pokemon they are quite strong
the best bird Pokemon on leaf green is pidgeot
i am personally a fan of exeggutor
The original startes; bulbasaur, charmander and squirtle are the starters (and in my opinion, they are the best).
you know in every Pokemon game . THE ELITE FOUR!
i like zapdos but i depends. snorlax and blissey are also preety good
dragonite is the strongest dragon there is in leafgreen
I think its moltres
I guess Zapdos
the best Pokemon are mewto and the rarest Pokemon ever mew.
pikapoo
Gyarados
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MunchingOrange
Charmander
There is no best Pokemon to catch, as you train each individually.
Ho oh, definitely
Blastoise, Starmie and Gyrados!