Quick Guide
- Locate the diving spot on Route 128 that leads to Seafloor Cavern.
- Navigate to the deepest room within Seafloor Cavern.
- Confront and defeat Aqua Leader Archie or Magma Leader Maxie.
Route 128
Route 128 is a water route that connects to Route 129 in the south and Ever Grande City to the east.
Like other water routes, you’ll encounter underwater trenches accessible with HM07 Dive. This route also features underwater grass patches, containing Pokémon that are exclusively found underwater.
Wild Pokémon
| Route 128 (Surfing) | |||
|---|---|---|---|
| Species | Tentacool | Pelipper | Tentacruel |
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| Encounter Chance | 50% | 35% | 15% |
| Levels | Lv. 25 | Lv. 25-35 | Lv. 30 |
| Route 128 (Fishing – Super Rod) | |||
|---|---|---|---|
| Species | Luvdisc | Wailmer | Corsola |
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| Encounter Chance | 60% | 35% | 5% |
| Levels | Lv. 35 | Lv. 30 | Lv. 40 |
| Route 128 (Underwater) | |||||
|---|---|---|---|---|---|
| Species | Chinchou | Clamperl | Lanturn | Corsola | Relicanth |
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| Encounter Chance | 50% | 30% | 15% | 4% | 1% |
| Levels | Lv. 25 | Lv. 30 | Lv. 30 | Lv. 30 | Lv. 35 |
Currently Obtainable Items
| Item | Method | Exact Location |
|---|---|---|
| Surface | ||
| Heart Scale (Hidden) | Southern side of the ring-shaped island |  |
| Heart Scale (Hidden) | Near a Fisherman, on the island with the route sign |  |
| Heart Scale (Hidden) | On a small island, east of the ring-shaped island |  |
| Underwater (Requires HM07 Dive) | ||
| Stone Plate (Hidden) | Northwest corner of Seafloor Cavern’s entrance |  |
| Draco Plate (Hidden) | West side of Seafloor Cavern’s entrance |  |
| Pixie Plate (Hidden) | Southeast side of Seafloor Cavern’s entrance |  |
| Adamant Orb (Hidden) | Accessed by diving in the middle of the ring-shaped island |  |
| Protein (Hidden) | Near Free Diver Mayu, under an isolated diving spot east of the main area |  |
| Pearl (Hidden) | Southeast corner, under an isolated diving spot east of the main area |  |
Diving Spot That Leads to Seafloor Cavern
In the main section of the route, you’ll come across a ring-shaped island that marks where Seafloor Cavern is located.
Dive near its southern side and you’ll spot the cavern entrance right in front of you underneath the water.
Seafloor Cavern
The Seafloor Cavern is a large underwater cave where the super-ancient Legendary Pokémon is sealed in deep slumber.
It consists of various interconnected maze-like rooms, featuring water current puzzles and boulder puzzles too. So besides HM03 Surf and HM07 Dive, make sure you have a Pokémon that knows HM04 Strength to solve boulder puzzles inside Seafloor Cavern.
When you reach the final room in this area, a cutscene will unfold featuring Kyogre or Groudon, alongside the leaders of Team Aqua and Team Magma.
Wild Pokémon
| Seafloor Cavern (Cave) | |
|---|---|
| Species | Golbat |
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| Encounter Chance | 100% |
| Levels | Lv. 33-36 |
| Seafloor Cavern (Surfing) | |||
|---|---|---|---|
| Species | Tentacruel | Golbat | |
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| Encounter Chance | 65% | 35% | |
| Levels | Lv. 25-30 | Lv. 25-35 | |
| Seafloor Cavern (Fishing – Super Rod) | |
|---|---|
| Species | Wailmer |
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| Encounter Chance | 100% |
| Levels | Lv. 30-40 |
Currently Obtainable Items
| Item | Method | Exact Location |
|---|---|---|
| TM55 Scald |
On the middle island, inside the second water current puzzle room (Requires HM04 Strength) |
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| TM26 Earthquake |
Near the staircase, southwest corner of the second-to-the-last room. (Requires HM04 Strength) |
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| Heart Scale (Hidden) | Southeast corner of the cavern’s entrance room |  |
| Escape Rope (Hidden) |
Southeast corner of the room with four ledges (Requires HM04 Strength) |
 |
Navigating the Seafloor Cavern (Step-by-Step)
Step 1: After entering the cavern, swim back up to the surface using HM07 Dive.
Step 2: Head north in the entrance room, surfing past the submarine until you’re back on land again.
Step 3: Enter the next room through the door to the north.
Step 4: Then in the next room, go north and make a right turn near a breakable rock.
Step 5: Push the nearby boulder into the hole on its right.
Step 6: Rather than going up the stairs, turn left and enter through the doorway towards the northwestern corner of the room.
Step 7: In the first boulder puzzle room, turn left and approach the nearby boulder.
Step 8: When you reach that boulder, push it into the hole on its left. Once you do, start heading north up the left-hand corridor.
Step 9: Proceed to the next door in the northwest corner of the room.
Step 10: This will take you into an area with water currents. Use HM03 Surf on the body of water.
Step 11: Ride the water current going north to get to the northeast corner of the room. The exact water current is pictured below.
Step 12: Once this water current drops you off, ride the water current immediately to your left.
Step 13: This water current should bring you over to the top-right corner of the room. Enter the next room through the door in the northeast corner.
Step 14: In this next room, use Strength to move the boulder to the right.
Step 15: Keep going north until you find the next door, going around the boulders and rocks in this room.
Step 16: In this next boulder puzzle, you’ll find the most boulders in any room. To begin, use Strength to push the boulder on the right into the nearby hole.
Step 17: In the next row, push the boulder located on the right over to the left (pictured below).
Step 18: Now walk up to the northern side of the right boulder in the third row. Then push it down once. This will open a pathway up towards the final row of boulders.
Step 19: Push the top-right boulder into the hole directly above. Then you can continue forward.
Step 20: If you did it correctly, you should have access to the door on the northern side of this room.
If you did any of the steps incorrectly then you can re-enter the room to reset the boulders’ positions.
Step 21: You should now be in the room before the deepest part of Seafloor Cavern. So follow the path heading east.
Step 22: At the top-right corner turn south then follow the narrow path ahead.
Step 23: Turn left at the bottom-right corner and descend the stairs located at the center of the room.
Step 24: After going down the stairs, you’ll find yourself in Seafloor Cavern’s deepest room. Approach Archie and Maxie to start the cutscene.
Team Aqua/Magma Leader Battle
During the cutscene, Aqua Leader Archie or Magma Leader Maxie will challenge you to one final battle.
This time, his team of four Pokémon will include his Ace Pokémon, which is now capable of Mega Evolution.
If you’re playing Alpha Sapphire
| Aqua Leader Archie | ||||
|---|---|---|---|---|
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| Pokémon | Mightyena Lv.41 | Muk Lv.41 | Golbat Lv.41 | Mega Sharpedo Lv.43 |
| Type | Dark | Poison | Poison / Flying | Water / Dark |
| Ability | Quick Feet | Stench | Inner Focus | Rough Skin |
| Held Item | None | None | None | Sharpedonite |
| Moves |
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If you’re playing Omega Ruby
| Magma Leader Maxie | ||||
|---|---|---|---|---|
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| Pokémon | Mightyena Lv.41 | Weezing Lv.41 | Golbat Lv.41 | Mega Camerupt Lv.43 |
| Type | Dark | Poison | Poison / Flying | Fire / Ground |
| Ability | Quick Feet | Levitate | Inner Focus | Magma Armor |
| Held Item | None | None | None | Cameruptite |
| Moves |
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After You Win
After winning the fight, another lengthy cutscene plays out.
Once Kyogre/Groudon is reawakened it escapes the cave and unleashes heavy rain/harsh sunlight across Hoenn.
After you return to the surface, Steven arrives and urges you to head to the Cave of Origin. He departs shortly afterwards, concluding the cutscene.
Route 127’s West Exit to Route 126
Your next destination is Sootopolis City, where the Cave of Origin is located.
So exit Route 128 and head north back to Route 127.
Continue surfing northwest on Route 127 until you reach its west exit to Route 126. From there, you’ll soon be able to access Sootopolis City’s entrance.
