i think it is by the entrance at Route 217 to Mt.cornet. The cave with the two rocks is where you catch it.
no you can't find a torchic egg in Pokemon platinum
You cannot find zekrom in pokemon platinum
You can't find rayquaza in pokemon platinum.
migrate it
The underground
You cant find a shiny regice unless you have action replay
You can't get him in platinum. You have to transfer him from a Sapphire/Ruby/Emerald.
regeggias in snowpoint temple with regirock regiice and registeel on platinum only
you can find regiice near the dewford town,surf northwest.
you must have regirock, registeel, regiice
regiice cant be caught in Pokemon diamond, it can in platinum version, how ever you can transfer a regiice from ruby, sapphire or emerald if you have 1, or there is the method of cheating in which i am against. cheats lead to glitches and unsolvable problems. u can only get the regi known as REGIGIGAS.
you get him at snowpoint temple in snowpoint city but first you need regiice regirock registeel.
I don't know where regiice is but you find regirock once you've defeated Cynthia twice and registeel in iron island when you get the national pokedex.
in a Nintendo event
you have to already have regigigas but i only know the areas mt. coronet,iron island,and i think route 228.
You can get Regiice in Mt.Coronet. I think Regirock Is In the desert between the resort area and survival area. And Registeel Is at Iron Island. Oh and also you can get it from Pokemon Emerald Version. Hope This Helps
Regice is on Island Cave on Route 105.