It depends statistically I think cloyster but snorlax is good with sleep talk and rest
squritle is the best cos at the end of the game u can get ricu and it has the best defence and attack also it is best 4 the gyms
dragonite is the strongest dragon there is in leafgreen
Shuckle, it has the highest defence and the highest special defence.
I think its moltres
I guess Zapdos
the best Pokemon are mewto and the rarest Pokemon ever mew.
pikapoo
Gyarados
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Charmander
MunchingOrange
There is no best Pokemon to catch, as you train each individually.