You get them revived at the mining museum in Oreburgh City, all Pokemon you receive are at lvl 20.
Regigigas
Your rival will have it at som point
snow point gym
On the way to snow point city.
beat the elite four!
its not you idiot. its only in Pokemon diamond Pearl and platinum.
beat the elite four and become champion
you have to defeat the elite four then the sailor in snow point city will take you there
use a pokemon to use fly to snow piont city gym and go to the harbor on the north
beat the battle migrate Pokemon get all the Pokemon in the game leval you Pokemon more get all the itoms in the game. you get the point
At this point of the storyline, you are supposed to go to pastoria city
you have to of beat the snow point gym leader you have to of beat the snow point gym leader