you first have to go to canalve city then go to ironisland then you have to go to where the exit is INSIDE but first you have to get the 11th movie regigigas. you will see a room go inside there then walk on all the circles inside the room then registeel will battle you but you can not SAVE. you should save when you go inside the room.
no you can only get it through a cheat or trade
you cant catch it in platnium but you can trade it
you cant
Yes you can.
no
no ditto is there
you get it from a fossil
Catch a wild magby
there are three that you can CATCH in pokemon emerald its Groudon, Kyogre, and rayquaza regice registeal regirock litos lotias
You can't you would have to catch one in Pokemon Heartgold or Pokemon Soulsilver and trade it to Platnium
No, you'll have to trade it from Platnium. Which in Platnium you find it in the Rock Peak Ruins.
top of mt cornet