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You can't catch it in Pokemon pearl unless you have an action replay. But if you did catch it in Pokemon emerald, sapphire, or ruby, then you can migrate it
Action Replay
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yes there is a code
you cant, get a action replay
no way!
you need action replay Then you can catch any Pokemon i like to use it in platinum and then trade the Pokemon to pearl
catch all the Pokemon or use an action replay
to catch another trainers Pokemon on pearl you have to have an action replay system or some kind of flash card
yes
It is not 100% possible to catch dialga in Pokemon pearl so basically you cannot catch it however with the AR (action replay) you can Hope this helps! :D
You can use a Action Reply codes to catch other trainers pokemon.