Nothing will happen you will just loose a really good Pokemon and you won't get it back.
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Easy if u dont catch DIALGA and you kill it, it will say dialga vanish or soming
Yes, go to pokemongoldsilver.com for information.WARNING! Dialga will be at level 1 if you get him.
It goes away forever! Unless you trade for it...
U can't
before you go to sunnyshore you need to get the main legendary in your game, pearl=palkia,diamond=dialga,platinum=giratina, once you've gotten it try to go there now and the guy will let you pass