The waters of Routes 132, 133, and 134 hold strong ocean currents that make travel difficult. While moving primarily westbound, these currents can send you sailing in almost any direction. This makes it necessary to revisit the area in order to explore every island.
From Route 132's route sign, Surf northwest to Swimmer ♂ Gilbert. Sail west from him to reach a Rare Candy near Fisherman Ronald on the northwest island. From here, take the northern-most current to the northern shallows of Route 133. Once there, Surf westward to reach the north side of the route's northwest island. Collect the Star Piece here, and talk to the Psychic to receive TM77 (Psych Up). From here, sail west to the calm waters on Route 134's north side. Take the current south of here to reach the large, thin island. Fight Black Belt Hitoshi, then collect the Carbos and two hidden Heart Scales. Surf west to reach the shallows with Dragon Tamer Aaron.
Fly or Soar back to Route 132. Enter the currents on the south side of the rocky island, then go north to reach a small island with a Protein. Stand on the isle's northern edge and sail west to reach the northwest island with Fisherman Ronald. Sail southward to ride the current to the southern of two shallows on Route 133, and collect the Big Pearl there. Surf westward to reach the south side of Route 133's northwest island, and battle Swimmer ♀ Sheryl. Sail west again to battle Bird Keeper Alex in the shallows of Route 134's largest island.
Fly or Soar back to Route 132. Enter the currents on the south side of the rocky island. Go south to fight Black Belt Kiyo on the cresent-shaped island, then sail from the isle's western-most point to reach an islet with TM34 (Sludge Wave) between two sandbars. Surf west to an island with Route 133's route sign and a Max Revive. Sail north through the ring of rocks to reach the route's central island, and battle Fisherman River and collect the Calcium. Surf west from here to arrive on Route 134's route-sign island, and move to its northwest corner. From here, sail west to an islet with a hidden Heart Scale. Go west again to the southwest shallows to fight Ace Trainer Elaine and pick up a Star Piece.
One Last Treasure
Fly or Soar back to Route 133 this time. Leave from the island's western or southern side to reach the nearest island with Bird Keeper Beck, Ace Trainer Warren, and Backpacker Grayson. Surf westward to reach some abandoned shallows that extend into Route 134. Sail west from the northwest corner to skirt around a deep pit of water, and arrive in a calm patch of ocean. Circle around the rocks to reach an islet with TM80 (Rock Slide).
To the Depths
After exploring the rest of the area, Fly or Soar back to Route 133. Pass through the western or southern gap in the ring of rocks to return to the shallows with three Trainers. Surf west to reach the abandoned shallows once more. Jump into the currents from the middle part of the west side to reach the deep, dark pit of water. Dive beneath the waves and follow the underwater path southward to a sunlit spot. The markings on the nearby wall are an ancient form of writing, and translate to Go up here. Surface in the sunlit spot to emerge in an ancient ruin known as the Sealed Chamber.
The Sealed Chamber is a mysterious ruin located in the depths of Route 134. The many stone tablets positioned around the chamber feature the same mysterious writing that was found near the underwater entrance. Solving some of Hoenn's oldest mysteries hinges on deciphering this age-old system.
The first chamber holds ten stone tablets that act as a key to decoding this ancient writing system, known as Braille. These 28 characters correspond to the 26 letters of the alphabet, as well as the comma and period. Inspect the markings on the cavern's north wall to reveal a phrase, which translates to Dig here. Using the field move causes the wall to fall away, granting you access to a second cavern.
The central ruins are encircled by six more stone tablets which tell of a powerful Pokémon that was sealed away. The message on the north wall reads, First comes Relicanth. Last comes Wailord. Wailord's pre-evolved form, Wailmer, can be found in many areas with the Good Rod or Super Rod, while Relicanth can be found only in a few underwater areas. Position these Pokémon in their respective places in your party and examine the wall again. This causes a mighty earthquake to rock the Sealed Chamber, while the sound of doors opening echoes from somewhere far away. Three separate ruins have now been opened, and each one holds a legendary Pokémon!
Island Cave, exterior
Island Cave, interior
The Island Cave sits on a small isle in the northwest part of Route 105. Snow covers the floor, and another coded message can be found on the north wall.
Examine the north wall to view the message, which reads, Stop and wait unmoving as time passes by you twice. Close the message box and stand still at the north wall for two full minutes. Once enough time passes, a secret passage appears out of nowhere!
Follow the snowy passage to the back cavern, where the legendary Pokémon Regice awaits. If you fail to catch it, Regice will reappear once you enter the Hall of Fame.
The Desert Ruins lie among the dunes of Route 111. Sand is scattered across the floor, and another coded message can be found on the north wall.
Examine the north wall to view the message, which reads, Right, right, down, down, then use your strength. Close the message box and move exactly as instructed, two steps east and two steps south. Have a Pokémon use Strength from this location, and a secret passage opens in the north wall!
Follow the sandy passage to the back cavern, where the legendary Pokémon Regirock awaits. If you fail to catch it, Regirock will reappear once you enter the Hall of Fame.
The Ancient Tomb stands on the southwest plateau of Route 120. A substance like liquid metal covers the floor, and another coded message can be found on the north wall.
Examine the north wall to view the message, which reads, Stand center. Aim to the sky with love and hope and time. Close the message box and move to the center of the cave. Have a Pokémon use Fly from this location, and a secret passage appears out of nowhere!
Follow the passage to the back cavern, where the legendary Pokémon Registeel awaits. If you fail to catch it, Registeel will reappear once you enter the Hall of Fame.
Start off by visiting Pacifidlog Town again, and speak to the girl in the northeast house. Now that you've caught the trio, the girl tells you one of four stories she heard from her grandfather, which serve as hints about an elusive legendary Pokémon.
"Grandpa used to say that this huge Pokémon sometimes visits our region..."
"But he said you'll need to wait in the middle when it's bright and Hoenn is overflowing with natural energy. I wonder if he meant you can't meet it at night."
"But you'll need to have three of its friends with you to meet it... I wonder what Pokémon they are. Does it have to do with the six dots?"
"But you'll need to have something cold to meet it... I wonder what he meant. Ice cream, maybe?"
"He told me that it comes to visit this iceberg kind of Pokémon. I can only think of one kind of iceberg Pokémon."
In order to meet the trio master, certain conditions must be met.
It may be necessary to let a day pass first, if all three titans were caught in a row. Wait until the sun rises again before setting out.
After meeting all requirements, return to Route 105 and revisit the Island Cave. Enter the back cavern during the day and move to the center of the room. An earthquake suddenly rocks the island, and the sound of something large approaching can be heard. If you fail to catch it, Regigigas will reappear once you enter the Hall of Fame.