Do you mean Regigigas?
If so, then you first need to attain all 3 of the regis (Regirock, Regice, and Registeel) then you can interact with the pokemon, and battle it.
in the snowpoint temple
Catch it in snowpoint city or migrate one from ruby, sapphire or emerald.
Sentret is found near a town farther from Snowpoint City.
easy!catch a jynx near snowpoint city, then breed it and get the egg!common sense...
Go to the cave in Celestic town,then go to the Snowpoint temple.
go to snowpoint city and look in the nearest grass. there are sneasels all over the place
Near Snowpoint City on Route 217,Acuity Lakefront. They're very rare.
yes by trading. the event is over already ---- It's still possible in platinum. You can catch the three Regis then bring them over to the ice temple in snowpoint. - MeritBadgeHelp
yes at acuity lakefront in Snowpoint city
how do you catch a mewtwo on Pokemon platinum
First have all three regis in your party and go to the last floor at Snowpoint Temple, on the fifth floor of the basement.
go catch Giratina and then go to the Sunshore City gym and fight the gym leader