You can hack it with an action replay. The other way only applies to Blue and Red versions. You can try catching a Missingno, but then you would be the one getting hacked.
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That's silly. You can't hack a Pokemon game without an Action Replay, unless you're talking about computer hacking a Pokemon. That'll take a lot of files.
Pokemon ash grey is not an official game It is a Rom hack of Pokemon FireRed
Yes u can hack Pokemon diamond and pearl without action replay but u can do it only on PC Watch this video and you will understand how to hack Pokemon diamond and pearl See the related links for the tutorials. Happy Hacking
You can't unless you hack it into your game 'cause there's no other way to get Darkrai without its special item or without Nintendo giving out an event Darkrai.
A hack of Pokemon SoulSilver that makes the game harder and adds new Pokemon not in SoulSilver, along with new game events.