Where do I find Regice, Regirock, and Registeel in Platinum without getting Regigigas?

Question

My friend and I have been trying to find them forever and it's kinda important.

Answer 1

You cannot without the event Regigigas so, No Sorry you can't. Unless you transfer them from Emerald/ruby/Sapphire.

Comments

Not recommended but an AR as well.

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How do I get Regigigas then? Sorry if I'm bugging you or something XD