That would be Mewtwo which can be found at the end of cerulean cave.
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!