Dont save it will never come back
maybe learn how to spell first
You can't kill Pokemon you can only make them faint. Dark and ghost types would help make them faint.
you have to follow the course of the story... ^_^
You can't faint in Victory Road and get to the Pokemon league. You have to make it through without fainting
you cant catch it anymore
no
Feed it Pokeblocks and make sure it doesn't faint in battles.
No , once it faints , it will not reappear , unless you save the game right before you make it faint .
Well technically, you can't KILL a Pokemon. You can just make it faint. When you make a legendary Pokemon faint, it will be gone until you start a new game.
Not allowing it to faint in battle
you go to valley works anod you have to make 200 Pokemon faint and then you find him
Make them eat berries and don't let them faint in battles.