i am personally a fan of exeggutor
Raikou can be found anywhere where grass is the best route would have to be route 1.
I read on another question that you go to viridan city and look in grass
the best bird Pokemon on leaf green is pidgeot
On route 24 in the grass you can find bellsprout but only in leafgreen.
The original startes; bulbasaur, charmander and squirtle are the starters (and in my opinion, they are the best).
grass and electric types
Raikou can be found anywhere where grass is the best route would have to be route 1.
I read on another question that you go to viridan city and look in grass
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
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Gyarados
MunchingOrange
Charmander