First of all it is Pokemon Platinum NOT Pokemon platnum. The best way I would is by using a master ball. but you can keep holding it off and about an hour later use a timer ball.
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By migrating Deoxys or an event.
you can not get regigigas! but you can catch regice, regirock, registel.
After beating Red, you can catch Groudon. If you have caught him and trade for a Kyogre you can also catch Reyquaza.
first you will need registeel regice and regirock, then go into the snowpoint temple and go to the bottom floor. approach the statue in the centre of the ice and make sure all the regi's are in your party and press [a] on the ds.
no
you need all the regi's to catch a regigigas in snowpoint city in the temple
CYou can cacth Palkia in ultra ball or master ball.
no
I AM THE BIGGEST POKIMON FAN! i loveeeeeeee POKIMON! I think that if i saw the inventor i might die! My fav is Pookachogg! PLEASE GO ON MY POKIMON WEBSITE www.ilovepokimon.com. And to answer ur question u must go in the sewers on India and pick up some poo and eat it. and then spit it out on the giant! Hope i helped :)
You don't. You can only catch Regigigas in Diamond, Pearl, and Platinum.
you cant get regigigas on Pokemon emerald its to ew of a Pokemon