Appendix:Omega Ruby and Alpha Sapphire walkthrough/Section 20

Sea Mauville

Sea Mauville, exterior

Sea Mauville, interior

Sea Mauville, storage hold

Sea Mauville, underwater hallway

Sea Mauville, underwater control room

Located to the north of Route 108, Sea Mauville was once a high-tech base where scientists and engineers dredged for natural resources beneath the water's surface. The facility was abandoned once it became evident that it was slowly falling over into the waves. Once slated for demolition, the half-sunken structure now exists as a refuge for water-dwelling Pokémon, and a popular tourist attraction.

Trainers

Trainer Pokémon Outside Sailor Duncan Reward: $1,120 Wailmer♂ Lv.26 No item Machoke♂ Lv.28 No item Tuber Charlie Reward: $112 Corphish♂ Lv.28 No item Inside Young Couple Lois & Hal Reward: $1,856 Illumise♀ Lv.29 No item Volbeat♂ Lv.29 No item Mysterious Sisters Scall & Ion Reward: $1,232 Chingling♀ Lv.29 No item Kirlia♀ Lv.28 No item Rematch Young Couple Lois & Hal* Reward: $2,176 Illumise♀ Lv.34 No item Volbeat♂ Lv.34 No item Young Couple Lois & Hal* Reward: $2,624 Illumise♀ Lv.41 No item Volbeat♂ Lv.41 No item Young Couple Lois & Hal* Reward: $2,880 Illumise♀ Lv.45 No item Volbeat♂ Lv.45 No item Young Couple Lois & Hal* Reward: $3,264 Illumise♀ Lv.51 No item Volbeat♂ Lv.51 No item Mysterious Sisters Scall & Ion* Reward: $1,760 Chimecho♀ Lv.41 No item Gardevoir♀ Lv.40 No item Mysterious Sisters Scall & Ion* Reward: $1,936 Chimecho♀ Lv.45 No item Gardevoir♀ Lv.45 No item Mysterious Sisters Scall & Ion* Reward: $2,200 Chimecho♀ Lv.51 No item Gardevoir♀ Lv.50 No item Trainers with a PokéNav by their names will be registered in the Trainer's Eyes or Match Call function after the first battle, and may have a rematch with the player with higher-level Pokémon.

Available Pokémon

Outside Pokémon Games Location Levels Rate Surfing Tentacool OR AS Surfing 15, 20 65% Wingull OR AS Surfing 15, 20 34% Pelipper OR AS Surfing 25 1% Fishing Magikarp OR AS Fishing Old Rod 10, 15 65% Tentacool OR AS Fishing Old Rod 5 35% Magikarp OR AS Fishing Good Rod 25 60% Tentacool OR AS Fishing Good Rod 25 35% Wailmer OR AS Fishing Good Rod 25 5% Wailmer OR AS Fishing Super Rod 30, 35, 40 100% Special Pokémon Ho-Oh OR AS Only one 50 One A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here. Inside Pokémon Games Location Levels Rate Surfing Tentacool OR AS Surfing 15, 20, 25 100% Fishing Magikarp OR AS Fishing Old Rod 10, 15 65% Tentacool OR AS Fishing Old Rod 5 35% Magikarp OR AS Fishing Good Rod 25 60% Tentacool OR AS Fishing Good Rod 25 35% Wailmer OR AS Fishing Good Rod 25 5% Wailmer OR AS Fishing Super Rod 30, 35, 40 100% Special Pokémon Spiritomb OR AS Only one 50 One Lugia OR AS Only one 50 One A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.

Items

Item Location Games Deck (requires Surf) Escape Rope South (left) of the Scientist  OR  AS  TM18 (Rain Dance) Stairway northeast (lower-right) of the Scientist  OR  AS  Inside (requires Surf) Max Repel Southern (left) hallway, near the water's edge  OR  AS  Key to Room 1 North (right) hallway, from the female Tuber (requires Dive)  OR  AS  White Herb North (right) side of the boxes near the entrance (requires Dive)  OR  AS  Dive Ball Room 1; south (left) hallway, upper-left room (requires Key to Room 1)  OR  AS  Key to Room 2 Room 1; south (left) hallway, upper-left room; inside a filing cabinet  OR  AS  Revive Room 2; south (left) hallway, lower-left room; near the Teammates  OR  AS  Key to Room 6 Room 2; south (left) hallway, lower-left room, from the Teammates  OR  AS  Storage Key North (right) hallway, upper-left room (requires Dive)  OR  AS  Destiny Knot Occasionally received after defeating Young Couple Lois & Hal in a rematch  OR  AS  Dawn Stone Occasionally received after defeating Mysterious Sisters Scall & Ion in a rematch  OR  AS  Outside (requires Surf, Dive) Key to Room 4 Northern exterior, from a Fisherman  OR  AS  Cargo hold (requires Surf, Dive) TM13 (Ice Beam) Upper-left corner of the room  OR  AS  Nugget ×4 Southeast (lower-left) from the door On the east (lower) side of the northern-most (upper-most) rectangular box East (down) from the south (left) side of the rectangular box opposite the door Along the south (left) wall, first item east (down) from TM13  OR  AS  Big Nugget ×8 East (down) from the door, near the water North (right) of the TM On the west (upper) side of the northern-most (right-most) rectangular box In a cluster along the south (left) wall (×3) The two eastern-most (lowest) items in the eastern (lower) item cluster  OR  AS  Luxury Ball Western (upper) item in the eastern (lowest) cluster of items  OR  AS  Beedrillite Southeast (lower-left) corner of the room (requires Surf)  OR  AS  Control room (requires Surf, Dive) Scanner At the bottom and to the right of the lower-right stairway  OR  AS

Exterior

Surf up to the facility and climb out of the water onto the sloped walkway. Upon doing so, the camera angle rotates 90° counter-clockwise to face westward. A guide stands at the corner to tell visitors about the facility. The Scientist here works for Captain Stern, and is looking for a certain item at the captain's request. He's searched all but the submerged parts of the facility and hasn't yet found it. Collect the nearby Escape Rope, and TM18 (Rain Dance) on the farthest stairway. Enter the interior through the doorway near the Scientist.

Interior (Left)

Boxes and debris prevent you from reaching the north (right) hallway from here, so take the south (left) hallway instead. The two doors to the left are locked, and the room to the right only has two Trainers, Young Couple Lois & Hal. Walk to the water's edge to grab a Max Repel, then sail out across the water and dive beneath the surface.

Underwater Hallway

Go east (down) to reach a stairway leading to the control room.

Control Room

Inspect the area near the bottom of the lower-right stairway to find something glimmering faintly in the water. Pick it up to reveal the Scanner.

Underwater Hallway

Take the northwest (upper-right) hallway and return to the surface to reach the far side of the facility.

Interior (Right)

Climb out of the water and follow the hallway around the corner to collect a White Herb near the entrance. Talk to the female Tuber nearby to receive the Key to Room 1; which opens the upper-left door in the south (left) hallway.

An Uneasy Feeling

Visit the lower-left room on the way back to the submerged section. There seems to be nothing here, but you feel as if you're being watched. Save the game, then search the bookshelf in the room's top-left corner to find an old report about the facility's history. After reading this, you get the same feeling again. Check your party or open your Bag so that the top screen is covered by a menu. Close the menu to find that an Odd Keystone has suddenly appeared behind you!

Types: Ghost Dark Ability: Pressure Held item: None Spiritomb Lv.50 Sucker Punch Dark Physical   --       Nasty Plot Dark Status   --       Memento Dark Status   --       Dark Pulse Dark Special   --

Interior (Left)

Room 1 contains Mysterious Sisters Scall & Ion, as well as a Dive Ball. Examine the filing cabinet on the left side of the room to obtain the Key to Room 2, which opens the lower-left door in this same hallway.

Room 2 contains a Revive and two Teammates. Speak to the girl on the right to receive the Key to Room 6, which opens the upper-right door in the north (right) hallway.

Interior (Right)

Room 6 holds nothing of interest aside from an exterior door on the far side of the room.

Exterior (Right)

Surf to the isle to the north (right) of the facility. Ask the Fisherman here if he's caught anything, and he gives you the Key to Room 4. This opens the upper-left room in the north (right) hallway.

Interior (Right)

Return to the interior of the facility and open the door to Room 4. Inside, you find the Storage Key, which opens an exterior door.

Storage Hold

After passing through Room 6 again, Surf west (up) from the Fisherman to reach a door marked, Storage. The room holds a dozen items scattered across the floor. A Street Thug enters just after you, and intends to make off with these treasures. Suddenly, an old man, who the Street Thug calls Uncle Raikoh, enters. It seems at first that both men are after the goods, but the old man is only interested in a Skitty doll that he calls Takao. Once the two men leave, you are free to collect the Luxury Ball, four Nuggets, eight Big Nuggets, and TM13 (Ice Beam). A sparkling spot in the lower-left corner denotes a Mega Stone; Surf around the boxes to reach the Beedrillite.

Hunting a Legend

Talk to the Scientist again, and he asks that you deliver the Scanner to Captain Stern back in Slateport. Hand it off to Stern in the harbor, and he rewards you with the Clear Bell^OR/Tidal Bell^AS, which features in some old legends in the far-off Johto region. Stern says he would sometimes see it glow when visiting Sea Mauville.

VS Ho-Oh^OR

Climb the slanted deck of the facility and the Clear Bell in your Bag begins to glow. Head up the incline to the platform's edge, then walk along one of the metal beams protruding over the water. A mysterious ring floats at the beam's end. Save the game, then examine this ring to reveal the legendary Ho-Oh! If you fail to catch it, Ho-Oh will reappear once you enter the Hall of Fame.

Types: Fire Flying Ability: Pressure Held item: None Ho-Oh Lv.50 Sunny Day Fire Status   --       Fire Blast Fire Special   --       Sacred Fire Fire Physical   --       Punishment Dark Physical   --

VS Lugia^AS

Enter the facility and dive down to the underwater control room, and the Tidal Bell in your Bag begins to glow. Go around the stairway to find a mysterious ring floating in the water near the back wall. Save the game, then examine this ring to reveal the legendary Lugia! If you fail to catch it, Lugia will reappear once you enter the Hall of Fame.

Types: Psychic Flying Ability: Pressure Held item: None Lugia Lv.50 Rain Dance Water Status   --       Hydro Pump Water Special   --       Aeroblast Flying Special   --       Punishment Dark Physical   --

Route 120

Scorched Slab

Scorched Slab, exterior^RS

Scorched Slab, 1F^RS

Return to Fortree City and Surf out into Route 120's northern lake to reach the Scorched Slab. A rare Fire-type Pokémon is believed to hide in the depths of these dark, stifling ruins.

Available Pokémon

1F Pokémon Games Location Levels Rate Golbat OR AS Cave 26-29 100% Surfing Zubat OR AS Surfing 20 50% Golbat OR AS Surfing 25, 30 50% Fishing Magikarp OR AS Fishing Old Rod 10, 15 65% Goldeen OR AS Fishing Old Rod 5 35% Magikarp OR AS Fishing Good Rod 25 60% Goldeen OR AS Fishing Good Rod 25 35% Barboach OR AS Fishing Good Rod 25 5% Barboach OR AS Fishing Super Rod 30, 35, 40 100% A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here. B1F Pokémon Games Location Levels Rate Golbat OR AS Cave 26-29 100% Horde Encounter Zubat OR AS Horde Encounter 14 100% Surfing Zubat OR AS Surfing 20 50% Golbat OR AS Surfing 25, 30 50% Fishing Magikarp OR AS Fishing Old Rod 10 65% Goldeen OR AS Fishing Old Rod 5 35% Magikarp OR AS Fishing Good Rod 25 60% Goldeen OR AS Fishing Good Rod 25 35% Barboach OR AS Fishing Good Rod 25 5% Barboach OR AS Fishing Super Rod 30, 35, 40 100% A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here. B2F Pokémon Games Location Levels Rate Golbat OR AS Cave 26-29 100% Horde Encounter Zubat OR AS Horde Encounter 14 100% A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here. B3F Pokémon Games Location Levels Rate Golbat OR AS Cave 26-29 100% Horde Encounter Zubat OR AS Horde Encounter 14 100% Special Pokémon Heatran OR AS Only one 50 One A colored background means that the Pokémon can be found in this location in the specified game. A white background with a colored letter means that the Pokémon cannot be found here.

Items
Item Location Games 1F TM11 (Sunny Day) North side of the cave  OR  AS  B1F Full Heal North of the stairs from 1F  OR  AS  Escape Rope Near the northeast corner of the northern pond (hidden)  OR  AS  B2F Super Potion West side of the upper level (hidden)  OR  AS  Nugget East side of the lower level (hidden)  OR  AS  Charizardite Y Near the southwest corner  OR  AS

1F

Climb out of the water to reach TM11 (Sunny Day), and take the northeast stairs to the basement.

B1F

The second floor is darker than the first. Go north to get a Full Heal, then east between the two ponds. In the southeast, you run into Flannery, who is also looking for the rare Pokémon. She's not quite up to the task, and heads back to Lavaridge to better prepare herself. Take the nearby stairs down to the next level.

B2F

B2F is shaped like two large rings, with an upper level and lower level. Collect the hidden Nugget on the lower level's east side, and the hidden Super Potion on the upper level's west side. Go down the southern of the two western stairways, then head south to find a Charizardite Y. Climb up the northern of the two western stairways, then down the northwest stairway. Push the boulder into place to create a shortcut, then go down the stairs to the north.

B3F

The oppressive heat of the final floor means simply breathing is difficult. Save the game and examine the mysterious ring floating near the north wall to reveal the legendary Heatran! If you fail to catch it, Heatran will reappear once you enter the Hall of Fame.

Types: Fire Steel Ability: Flash Fire Held item: None Heatran Lv.50 Metal Sound Steel Status   --       Crunch Dark Physical   --       Scary Face Normal Status   --       Lava Plume Fire Special   --

Mirage Spots

There are conditional Mirage spots to collect the Legendaries from Johto, Sinnoh, and Unova that cannot be found elsewhere. These locations will only appear after meeting certain conditions. Like with other Legendary Pokémon, if you fail to catch these creatures, they will not reappear until after you enter the Hall of Fame. See the Soaring Legendaries guide for battle coverage for these specific Mirage Spots.

This article is part of Project Walkthroughs, a Bulbapedia project that aims to write comprehensive step-by-step guides on each Pokémon game.