well if you want to get all of the regis 1 way u can migrate them from ruby or sapphire
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u cant caught the regis in Pokemon pearl if you want the regis migrate it from sapphire,ruby or emerald
Trade them in from Ruby/Sapphire/Emerald.
I believe their isn't a code you can't get the regi's in Pokemon pearl unless you trade.
You must Migrate from Sapphire, Ruby or Emrald.
to get to navel rock you have to have garchomp th regis arceus lugia or ho-oh