You cannot. Whatever you can do in the game naturally (i.e. leveling up normally, by battling and using the rare candies available) is all that you can do to level up. The only methods to level up faster involve cheats.
No, you cannot.
Get 50 Pokemon...
You cannot get to island 8 without cheats
Yes by migrating it from firered or leafgreen.
There are no cheats for ANY Pokemon games unless you have a gameshark
http://www.psypokes.com/lab/shiny.php
go to the mystery gift and use it daily then you'll get it
you can trade it
The Pokemon Leaf Green don't have a Cheats.
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nope!you can't complete it you have to have cheats or firered,leafgreen,sappeir,emaral
Use a game shark or an ar, cause there is curently no way to aquire Arceus without cheats.