In the Hippowdon Temple, first capture 266 Pokemon in the browser, go to the Hippowdon Temple with the 3 regi's, go to the secret area place the 3 regi's on the pedestrial and capture him.
regigigas
In Hippowdon Temple, but only once you have filled your Browser.
You do not catch deoxys in Pokemon ranger shadows of almia.
To get Vaporeon in Pokemon Ranger Shadows of Almia go to the Almia Castle or Altru Tower
Unfortunately, even though there are 493 Pokemon as of the release of Pokemon Ranger: Shadows of Almia, there are not 277 Pokemon in the game and therefore not a Pokemon numbered 277. The Almia Browser goes up to R-267 (Regigigas). Even with the option of Wi-Fi events making an extra three Pokemon available, it still does not equate to having a Pokemon numbered R-277 in the Almia Browser.
Catch all Pokémon available in the game then go to the Union. They'll say Hippowdon Temple has holes in the arrow room so get 3 Regis from Vien forest, Almia Castle and Chroma ruins then go in hole and Regis' door opens and catch Regigigas.
Hippowdon temple.
in shadows of almia, of course.
You have to have Pokemon Ranger Shadows of Almia
In regular Ranger you just catch them to finish the Browser. In Shadows of Almia you catch them and bring them to Hippowdon Temple to catch Regigigas.
after you catch all 266 prior Pokemon go to hippowdon temple with regice,regirock and registeel.Where you slide on arrows there will be a hole.Go in it and place regis on their places and the road to regigigas will be open
it is in Hippowdon Temple