You must beat the elite 4!Then you can go to 4,5,6,and 7.
Its on 4th island in leaf green and fire red
Happiny is a 4th generation Pokemon none of those Pokemon existed in previous generation games like leafgreen.
Impossible since its a 4th generation pokemon.
celadon city grass Pokemon
You can't because it is a 4th Generation Pokemon available in Pokemon Diamond and Pearl.
You have to get the National dex and Beat the Pokemon league. Then, give the ruby to celio and he will give you a Rainbow Pass. Allowing you to go to the sevii islands. (1 - 7 islands)
It's Erika of Celadon City.
None because poison jab is a 4th generation move.
That item doesn't exist in that game. Only in the 4th gen Pokemon games you can get it.
You have to defeat Erika.
You can't because mamoswine was made in the 4th generation games diamond and pearl and platinum it never existed in leafgreen.
yes, try catching a ditto, then a legendary pokemon. go to the 4th island, then to the day care. let them grow the legendary pokemon and ditto. then come back after some time to the old man outside and he will give you an egg which will hatch to your legendary pokemon.