The Pokemon Leaf Green don't have a Cheats.
poo
uhh... there isn't any...
There are no cheats for ANY Pokemon games unless you have a gameshark
you can trade it
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Get 50 Pokemon...
No, you cannot.
no now shhh im trying to get to sleep
There are always great cheats for any game on www.cheatplanet.com, or www.gamewinners.com
Go to Cheats -> Cheat list... -> Gameshark... and then type in the code.
You cannot get to island 8 without cheats
Yes by migrating it from firered or leafgreen.
Trading, migrating from LeafGreen or FireRed, or cheats.
I really don't know, but you shouldn't use cheats on any Pokemon game; your game will be Ruined.