All 3 must be traded from either ruby, sapphire or emerald.
For Pokemon ruby you can catch the three regis, rayquaza, groudon, and latios/latias. In sapphire you can catch the three regis, rayquaza, kyogre, and latios/latias. However, in emerald you can catch kyogre, groudon, rayquaza, the three regis, and latios/latias.
No, they will need to be traded.
No you cannot get the regis nor any hoenn Pokemon all must be traded to you from ruby, sapphire and emerald.
You need relicanth and wailord to catch the regis in sapphire/ruby/emerald. You cannot catch the three regis in platinum unless you have the event Regigigas (this event has now ended). If you have the special regigigas in your party, three new caves will open up in Sinnoh and you will be able to catch the three regis.
no you do not just the Pokemon relicanth and wailord.
nothing, there just there to catch to fill out your browser.
It is not possible unless a trade is made or pokemon transfer lab on route 15.
First get all other 266 Pokemon in the Browser then you will get a mission to go to hippodon temple. Catch the 3 Regis then go down a hole in the temple put the three regis on these things then you vs Regigigas
Regigiggas is in there but you need to have the other three regis.
you can't catch any of the three regis on any DS game except platnium.sorry:(
Actually you're wrong you can NOT get the regis in Pokemon diamond, to get the regis you need Pokemon ruby/Sapphire/emerald you can get all three regis there(regi ice, regi steel, regi rock) althought if you migrate all of the regis onto Pokemon diamond you can get regi gigas(king regi) you will find him in the snowpoint temple after beating the elite four. Thanks hope i helped ^.^
you have to catch 151 Pokemon and then go to professor oak . He will ask you to take one Pokemon from the three Pokemon , the Pokemon are chikorita , cyndaquil and totdile.