List of unrevisitable locations

This is a list of locations in the Pokémon games that cannot be revisited after a certain point.

In the core series games

Kanto

S.S. Anne

In the Generation I games and Pokémon FireRed, LeafGreen, Let's Go, Pikachu!, and Let's Go, Eevee!, after obtaining HM01 (Cut)^RBY^FRLG/learning Chop Down^PE and leaving the S.S. Anne, the ship sets sail and can no longer be accessed.

Additionally, in all of these games except Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!, the area containing the pier leading to the S.S. Anne also becomes inaccessible, an area which famously contains a truck. In Pokémon: Let's Go, Pikachu! and Let's Go, Eevee!, the player can freely revisit this pier, although the truck is no longer present.

Johto

Sinjoh Ruins

Once the player obtains a Pokémon of myth at the Mystri Stage of the Sinjoh Ruins, they are teleported back to the Ruins of Alph, and the Sinjoh Ruins become inaccessible. The player can visit the Sinjoh Ruins twice: Once using an Arceus obtained from the Hall of Origin, and once using an Arceus met in a fateful encounter. Once the player has visited the Sinjoh Ruins twice (by using both methods to visit) and obtained two of the three Pokémon of myth, the ruins become permanently inaccessible.

Hoenn

Inside of Truck

At the beginning a new game of Pokémon Ruby, Sapphire, Emerald, Omega Ruby, and Alpha Sapphire, the player is riding inside the moving truck during their move to Littleroot Town. Once the player exits the truck, the truck departs.

Trick House

In the Trick House, once a puzzle is completed and the Trick Master has been spoken to, it becomes permanently inaccessible, and any uncollected items within it are permanently lost.

Team Magma Hideout/Team Aqua Hideout

In Pokémon Ruby and Sapphire, after obtaining the Mind Badge in Mossdeep City, the entrance to the Magma Hideout^R/Aqua Hideout^S is sealed and can no longer be accessed.

In Pokémon Emerald, once opened, the entrances to both the Magma Hideout and Aqua Hideout remain open permanently.

Southern Island

In Pokémon Ruby and Sapphire only, after battling Latias^R/Latios^S, Southern Island is no longer be accessible regardless of whether or not the player has the Eon Ticket in their bag.

In Pokémon Emerald, the island remains accessible even after Latias/Latios has been captured.

Cave of Origin

In Pokémon Emerald, after the player has accessed the Sky Pillar during the Kyogre and Groudon crisis, Steven blocks the entrance to the Cave of Origin; after the crisis passes, an old man blocks the entrance, stating the cave will sleep, making the cave permanently inaccessible.

In Ruby and Sapphire as well as Pokémon Omega Ruby and Alpha Sapphire, the cave remains accessible even after the crisis has been resolved.

Mirage Tower

Once the player obtains the Claw Fossil or Root Fossil from the Mirage Tower, the player falls out of the tower, which crumbles, becoming inaccessible afterward. This location only exists in Pokémon Emerald.

Marine Cave

After the player captures Kyogre, the deep water to access underwater areas leading to the Marine Cave entrance no longer appears, rendering the cave and the underwater sections inaccessible. Notably, the two underwater sections in Route 127 leading to Marine Cave are part of the main underwater map, and parts of these two sections can be seen from the main underwater sections of Route 127, regardless of whether or not the deep water to access them is present.

Marine Cave and these underwater sections only exist in Pokémon Emerald.

Terra Cave

After the player captures Groudon, the entrances to Terra Cave no longer appear, rendering it inaccessible.

Terra Cave only exists in Pokémon Emerald.

Sinnoh

Distortion World

The section of the Distortion World entered from Spear Pillar cannot be revisited once the player leaves. While it is possible to enter the Distortion World via Turnback Cave, this is a different section of the Distortion World.

The Distortion World only exists in Pokémon Platinum.

Unova

N's Castle

In Pokémon Black and White, after defeating Ghetsis, the stairs leading to N's Castle disappear, rendering N's Castle inaccessible.

Giant Chasm

In Pokémon Black and White, after catching Kyurem, Kyurem's cave in the Giant Chasm becomes inaccessible.

Kalos

Team Flare Secret HQ

In Pokémon X and Y, after the final battle with Lysandre, Team Flare Secret HQ is destroyed, rendering it inaccessible.

Hyperspace Lumiose areas

In the Mega Dimension DLC of Pokémon Legends: Z-A, the player cannot revisit any of the following pockets of Hyperspace Lumiose after defeating their respective Rogue Mega-Evolved (or Primal-Reverted) Pokémon:

Alola

Ultra Space

In Pokémon Sun and Moon, the player cannot revisit Ultra Space after defeating Lusamine.

In Pokémon Ultra Sun and Ultra Moon, the player can repeatedly visit the Ultra Deep Sea (which this location is now named) via the Ultra Warp Ride.

Aether Paradise

The Trophy Room beneath Lusamine's mansion in Aether Paradise can only be accessed when battling Lusamine and, in Pokémon Ultra Sun and Ultra Moon, Giovanni.

Team Rocket's Castle

After defeating Giovanni in Pokémon Ultra Sun and Ultra Moon, Team Rocket's Castle turns back into Lusamine's mansion. Any items not picked up can be obtained by speaking to a Janitor outside the mansion. The Electrode, however, are lost permanently.

Galar

Stadiums

In Pokémon Sword and Shield, while players can revisit the Stadiums, the specific arenas where Gym battles take place are no longer accessible.

Paldea

Zero Lab

In Pokémon Scarlet and Violet, after the player has obtained the Indigo Disk during The Hidden Treasure of Area Zero Part 2: The Indigo Disk, they use it to redirect the elevator in the Zero Lab to the Area Zero Underdepths, rendering the time machine room inaccessible.

In the spin-off games

Pokémon Mystery Dungeon series

This section is incomplete.
Please feel free to edit this section to add missing information and complete it.

Dungeons marked with an asterisk can be revisited via a Friend Rescue.

Red Rescue Team and Blue Rescue Team/Rescue Team DX

Explorers of Time, Darkness, and Sky

Super Mystery Dungeon

Pokémon Ranger series

Ranger

Safra Sea

Guardian Signs

Notes

↑ In Explorers of Sky, this location can be revisited during In the Future of Darkness, but it functions as an entirely separate dungeon.
↑ After it is destroyed by the Sky Fortress.