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.
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After Action Replay is loaded, you can take the game card out. Then, you will be able to use it's features without the action replay game card (you usually put in the game you wish to hack) * This is wrong, I mean that take the game card out and still have action replay in the ds but without the game card while playing a game.
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 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.
It is impossible unless u have action replay or another hack system
with an action replay or some hack...