migrate them from ruby, sapphire or emerald.
you don't need regigigas for registeel. you need reegisteel, regirock and regice for regigigas on Pokemon pearl or diamond
You have to get Regice regrock and regsteel to get the champion bridge it open when you get the king of Regice Regrock and Regsteel to get Regigigas.
uhh i dont know
Trade it from ruby, sapphire or emerald.
You can only get Registeel by migrating it from the Generation III Pokemon games to the Pal Park.
only with a hacking device.
Rayqyasa Groudon Kyrogye Latios/latias regirock regice regsteel
Go to the route to the left of lilycove and go above the lake at the very left of that route
Pokemon diamond
Pokemon diamond Pokemon diamond Pokemon diamond
iron island at the end when there's a black entrance you have to have an event regigigas in your party to make something inside appear
you cant be a Pokemon in Pokemon diamond