their is two leagues one of them is kanto and the other is jhto hope i helped :-)
You can beat the Pokemon League it is just one of the harder Leagues than in Pokemon Emerald or Diamond.
Not in Pokemon leafgreen only in Pokemon Firered never ever in Pokemon leafgreen And in Pokemon firered it is rare in power plant not available in Pokemon leafgreen?
No. there can only be one Pokemon league on each game
There are multiple legendary pokemon. But there isn't one that the game focuses on.
AT THE BEGINNING OF THE GAME!!!!! or one,two, or three island
Must trade them from another leafgreen or firered sorry.
You can get only one Master Ball in LeafGreen (as in every Pokemon Game) in the Silph Co. by Giovanni. Another way to get more Master Balls in LeafGreen, is to hack your game using Action Replay (if your game is in a Game Console, because there's another way of hacking Pokemon games if they are in your computer). Hope I helped :)
If you meant squirtle then you must have chosen it at the beginning of the game if not you need to get one from another leafgreen or firered.
There are 2 sleeping Pokemon in the game: One west of Celadon City, One east of Vermilion City.
All starter Pokemon except the one you chose must be traded to you from another game that has them.
For some reason the programmers took out the slot machines and in place only kept the card minigame so no one knows why the game corner is not similar to the original or that of leafgreen.
There is only one eevee in Pokemon leaf green but you can breed them at the daycare or trade from another game.