You get Regigigas in Team Shadows Room along with Regice and Regirock, Registeel is not in it unless you use a cheat code :)
Entei can be found in Nimbasa City in Pokemon Indigo.
Yes, there is every Pokemon on Indigo. The easiest way to find Pokemon is to go to the ROOMS.
I doubt you will find Giratina on Pokemon indigo as it is not a generation 1 Pokemon (it isn't one of the first 151 Pokemon species)
NERD!
You find it in pokemon! it's obvious!
where to find a vulpix on pokemon UNOVARPG
anywhere
Find It In League Champion - Steven on the online Pokemon Indigo
you cant get all the regis only regigigas.
You cant find it you can only get it as a starter pokemon.
You can find one in a room or pokemon locator
you can't find N in pokemon indigo. N is the second main antagonist (=villain) in pokemon black and white.