If you put a seal on a pokeball on the game computer, when you throw that Pokemon out, it will show the seal show then. (Don't worry! It took me a while to figure that out too!) Hope this helps!
An action replay DS does work on Pokemon Diamond & Pearl I use it all the TIME!
For most routes, the pokemon be the same. But a couple of routes will be different compared to diamond/pearl.
no
you have to work on your nationaldexand become a Pokemon master
You can not find Palkia on Pokemon diamond unless, you use action replay that might not work or if you trade with somone that has pearl.
of course
the code only works on pearl and diamond Mewtwo
yes it works with any diamond pearl or platinum game
no only in pearl and dimoand
Yes it is for diamond and pearl i have both and it works so yes it does work!!!
some times they do or sometimes it will just have a different code
the reason why it won't work is because you need the event arceus from diamond or pearl.