I have pokemon leafgreen, and i hear you can have cheats on that game so i was wondering where do you type in the cheats?? im in cerulean city!! and im a girl.. if that makes any difference
There aren't any cheats you can type directly into the game. You'll need a device such as a Gameshark and a list of the codes in order to cheat at the game. They can be bought pretty much anywhere that sells video games, but you might need to get this one on the internet since GBA is a little passé now. Some simple Googling will show you how to use the device.
My advice is not to cheat at Pokemon at all, it makes the game boring, but to each his own.