Return to Answer

• Available on: Both Omega Ruby and Alpha Sapphire, once 'unlocked'
• Location: Island Cave (same as Regice)
• Required Party Pokemon: Regice with a nickname (yes, really), Registeel and Regirock
• Required Item: Regice needs to hold a frozen item (Snowball, Nevermelt Ice, CasteliaCone)
• Date/Time available: During the Day

• Available on: Both Omega Ruby and Alpha Sapphire, once 'unlocked'
• Location: Island Cave (same as Regice)
• Required Party Pokemon: Regice with a nickname (yes, really), Registeel and Regirock. Registeel and Regirock MUST NOT be nicknamed, and the OT for each likely has to be the trainer on the current save.
• Required Item: Regice needs to hold a frozen item (Snowball, Nevermelt Ice, CasteliaCone)
• Date/Time available: During the Day

1. You need to put Relicanth at the front of your party, and Wailord in the 6th position. Note it has to be Wailord, not Wailmer.
2. Fly to Pacifidlog Town, and head East to the fast currents.
3. Stick as south as possible on the fast currents until the island with the trainers. Then, stick to the middle.
4. You should end up in a place where you can Dive, surrounded by strong currents.
5. Dive down and head south as far as you can go
6. Read the Braille text, and resurface.
7. Head up and again, Read the Braille text, and use Dig.
8. Enter the tunnel and read the next set of text. It tells you to put Relicanth and Wailord into 1st and 6th position respectively.
9. Do so and interact with the text again. This will set off 3 Earthquakes and unlock the Regi caves in the overworld.
10. Exit the cave, you no longer need any Party restrictions and can box Relicanth and Wailord.

1. You need to put Relicanth at the front of your party, and Wailord in the 6th position. Note it has to be Wailord, not Wailmer.
2. Fly to Pacifidlog Town, and head West to the fast currents.
3. Stick as south as possible on the fast currents until the island with the trainers. Then, stick to the middle.
4. You should end up in a place where you can Dive, surrounded by strong currents.
5. Dive down and head south as far as you can go
6. Read the Braille text, and resurface.
7. Head up and again, Read the Braille text, and use Dig.
8. Enter the tunnel and read the next set of text. It tells you to put Relicanth and Wailord into 1st and 6th position respectively.
9. Do so and interact with the text again. This will set off 3 Earthquakes and unlock the Regi caves in the overworld.
10. Exit the cave, you no longer need any Party restrictions and can box Relicanth and Wailord.

Also note that any prerequisite Legendary Pokemon that are listed have to be caught in 6th generation games. For example, Tornadus and Thundurus must be obtained from copies of ORAS when encountering Landorus - it isn't enough to transfer them up from earlier games!

Having since tested this again, note that any prerequisite Pokemon don't necessarily need to be caught in 6th generation games as was previously stated.