In the start menu (the menu where you select your game to start playing) you select "new game" and after wards, save that new game and it will replace your old game
no
If you erase your Pokemon file on any Pokemon game it is impossible to bring it back.
They disappear forever.
go to new game and do what it says then you will erase your game
start a new game
they mess up your game permenantly or until you erase your game
yes
1. if you make a new game and save, you will erase your previous game.
Of course you can!
yes
press up select and b together
you erase your game and use action replay to copy it to another game