You can go to the battle frontier, catch groudon and kyogre, and go to the secret place in the safari zone where you can catch Pokemon from the johto region.
Pokemon Are Not Evil they just faint the opjectson of the game is to beat the champion in the Pokemon league
you can't get the black flute in leaf green but you can in Pokemon ruby, sapphire and emerald then trade it to leaf green.
go to mossdeep city then head left and go past the white rock at the end their should be a house with a fisherman in it and he will give it to you
latios and latias appear in random patches of grass and areas of water after you catch Rayquaza or make him faint.(after saving the world in Sootopolis.)
In the Pokemon league.
You can't be Pokemon league.
ABXY
Sadly, no. The creators of the game forgot to add in the Pokedex, so trading is impossible without GameShark. :(
no
There is no Johto league.
use action replay
Yes you do.