One of the most publicized parts of Pokemon Omega Ruby and Alpha Sapphire is the ability for trainers to catch every Legendary Pokemon in existence. From Lugia to Giratina, these Legendary Pokemon are the crown jewel of every Pokemon Trainer and now that ORAS has been released the method of obtaining these rare and powerful ‘Mon has now been revealed.
A lot of these Legendary Pokemon are obtainable via the new Soar overworld ability that you can perform once you get Latios or Latias -- depending on whether you have Omega Ruby or Alpha Sapphire -- and some occur only after completing the Pokemon ORAS post-game, Delta Episode where Rayquaza and Deoxys face off.
The following list will be broken up between Legendary Pokemon that are ‘stationary’ and you can approach, and those that you will have to Soar and enter certain portals to encounter.
NOTE: At the time of this writing, some Legendary Pokemon have not been discovered yet. These include Victini, Shaymin and Keldeo. We will update this article as we learn more.
The CoroCoro leak showing Shaymin, Victini and Keldeo
Here is the locations and methods to finding each and every Legendary Pokemon in Omega Ruby and Alpha Sapphire.
STATIONARY POKEMON Groudon/Kyogre
In the main story, go to the Cave of Origin and you will have to face off against either Groudon or Kyogre -- depending which version you have. They will approach you and immediately primal evolve. They are at level 45 so save that Master Ball for some of the other big boys later on in this list.
The Regi Trio
The method to encountering the Regis are pretty elaborate but they are all the same, just in different locations. They are all at level 40.
Have a Relicanth in the first of your party and Wailord the sixth Pokemon in your party.
Go to Route 134 and take the correct paths till you get to a spot where you can Dive.
Follow the path to where the Braille descriptions are and resurface, then go to the next Braille inscriptions and use the move Dig.
With Relicanth #1 and Wailord #6, read the inscription and three earthquakes will trigger opening up the lair of the Regis in their respective areas.
Go to Route 111 and go to the bottom of the area -- this is called the Desert Ruins.
Go to the inscription on the wall in the tomb and perform the following combination of movements:
Right, Right, Down, Down and use Strength.
On the small reef of the western part of Route 105, Surf to the Island Cave.
Read the Braille inscription in the cave -- tells you to wait. After two minutes, the cave will open.
Found west of Lilycove City in Route 120, called the Ancient Tomb.
Use Fly in the middle of the room and Registeel will appear.
During the Delta Episode, you and Zinnia will make your ways up the Sky Pillar. Once at the top, you will awaken Rayquaza and it will challenge you.
Rayquaza is at level 70.
After capturing Rayquaza -- and defeating Zinnia -- Deoxys will appear and you will ride Mega Rayquaza into space to confront it.
Deoxys is at Level 80.
Travel to Pacifidlog Town and talk to the girl in the northeastern house. She will tell you stories her grandfather told her but at random she will tell a story about Regigigas.
Take all three Regis in your party to the Island Cave -- where Regice was -- and make Regice hold either Nevermelt Ice, Snowball or Castelia Cone. Regice also needs a nickname (because clearly, Regice was his favorite).
After the Delta Episode, go to Sea Mauville and get the Scanner in the basement. Take the scanner to Captain Stern in Slateport City and he will give you either the Clear Bell (Omega Ruby) or the Tidal Bell (Alpha Sapphire).
Go back to Sea Mauville and your bell will resonate on the deck (Ruby) or the basement (Sapphire) summoning either Lugia (Tidal) or Ho-Oh (Clear).
After the Delta Episode, go to the Scorched Slab and the Gym Leader, Flannery will be there looking for Heatran.
Go to the bottom of the cave and a portal will appear, interact and battle Heatran.
MIRAGE SPOTS Uxie, Mesprit, Azelf
In the Nameless Cavern -- near Sootopolis City -- Soar around the area and you’ll find this Cavern
Your Pokemon need to be at max happiness -- at least one.
Portal will appear in the cave and one of the three Legendaries will appear at random. Every 12 hours after, another will appear.
After obtaining Uxie, Mesprit and Azelf -- and having them on your team -- while soaring near Dewford Town a large portal will open up. Once you approach it, you’ll be asked if you want to enter.
Palkia will challenge you in Omega Ruby and Dialga in Alpha Sapphire at level 50.
Have Palkia and Dialga on your team and return to the same area near Dewford Town.
Soar and enter the portal which should contain Giratina at level 50.
Cobalion, Terrakion, Virizion
Soar around Pacifidlog Town you’ll discover a large area of land called the Pathless Plain. When you land follow the small path to the peninsula where a portal awaits.
One of the three Legendary Pokemon will appear at random inside the portal with the others appearing 12 hours later.
Soar in the southeast area of Mauville City where you’ll find the Fabled Cave. There should be star above it
Inside the cave, a portal will appear containing either Reshiram (Ruby) or Zekrom (Sapphire) if you have a high leveled Pokemon on your team.
Need both Reshiram and Zekrom on your team.
Soar behind Mt. Chimney to an area called the Gnarled Den.
Enter the den and the portal containing Kyurem will appear. Be sure to use the Dowsing Machine to find the DNA Splicer in that Den as well.
Raikou, Entei, Suicune
Need Ho-Oh and Lugia on your team.
Soar near Rustboro City to the Trackless Forest. A portal containing one of the three Legendary Pokemon will appear.
Once one is caught, take the newly captured Legendary off your team and repeat the process.
Need Castform on your team
Soar over Fortree City to find a portal where the Legendary resides; Tornadus (Ruby), Thunderus (Sapphire).
Need both Tornadus and Thunderus on your team.
Soar above Fortree City and a new portal will appear with Landorus inside.
Some point in the Mirage Islands, a portal will appear randomly every day.
For Cresselia, south of Ever Grande City a portal will appear. Will update as more information comes out.