It all depends on the players knowledge of the game if they don't know anything it can take very long vs an expert who can probably finish it in 2 to 3 days.
Its only obtainable from a Nintendo event which has long since passed.
Yes as long as you teach it physical attacks like karate chop.
You can't mantyke doesn't exist in leafgreen.
You have to trade with emerald of ruby to get groudon in leafgreen.
It shouldn't matter. as long as you have a grass or electric type or both.
You can fly there or take the long the long way with the boat.
I don't think you could.I've had Pokemon leafgreen for a long time.I know what your talking about.Like on Pokemon Ruby and Sapphire.
anywhere as long if you have 1 of the evolvetions of bulbasaur first in your party
Yes you can trade leafgreen version Pokemon to another leafgreen version.
Yes has long as it can learn it in the first place.
Firered and leafgreen both can catch different Pokemon but there pokedex is the same, here is some examples: magmar only in leafgreen not firered, oddish in firered not leafgreen, ekans in firered not leafgreen, bellsprout in leafgreen not firered, pinsir in leafgreen not firered.
Norman is not in leafgreen.
in leafgreen u have to get it from a Nintendo event and in sapphire after u get it in leafgreen u trade it from leafgreen to sapphire
Its only obtainable from a Nintendo event which has long since passed.
Yes as long as you teach it physical attacks like karate chop.
The lottery is not in leafgreen.
Shuckle is not available in Leafgreen. You will need to trade one from Emerald to Leafgreen.