This article contains major spoilers!

Lost Islands are a set of separate islands far from the Main Island of Roria, never seen on the Roria Town Map. Due to the unique position and isolation of this archipelago, these islands hold many mysteries that researchers are continuing to discover. One the most interesting mysteries about the island is the discovery of the few unique crystals that emit the same power as Mega Stones, which are known as Z-Crystals.

In addition, foreign Pokémon have been discovered and can be encountered on these islands, including new Regional Variants of some existing Pokémon in Roria. Certain Pokémon species, which would otherwise evolve into their Kanto Form evolutions, will evolve into their Alola Form evolutions instead on these islands when the requirements are met.

Notable Places

Research Camp and Z-Crystal Quest

There are few tents found above the ramp after landing on the larger island from the Double Decca. A small group of researchers can be seen working hard on analyzing data obtained from the Pokémon on Lost Islands, exotic to the region of Roria. One of the blackboards is shown with an art of seemingly Kantonian Meowth, but with the type crossed out and corrected as Dark, signifying that they have discovered Alolan Meowth.

In front of this research camp, a female Paleontologist belonging to this squad explains about the mysterious Z-Crystals, noting that they are hard to reach. She then notices that the player is a Pokémon Trainer, and requests him or her to search for the Z-Crystals after giving a new Z-Crystal pouch to the player, thus beginning the side quest for acquiring the Z-Crystals.

The Z-Crystals located here correspond to the 3 main types of Pokémon and are rather easy to find compared to those hidden in deeper areas of this archipelago. Note that if the player does not talk to that female Paleontologist first, he or she cannot pick up the Z-Crystals.

Grassium Z is the easiest to get, as it does not require any HMs. Start from a small "cave" near the shipwreck site. Some slopes can be ascended, although they are rather hard to spot. Repeat the same process in the higher cave, and Grassium Z is in sight. Firium Z necessitates multiple uses of HM8 Rock Climb in the middle of this island, where a volcanic chamber can be accessed afterwards. Passing through more camouflaged slopes allow the player to pick up Firium Z. Waterium Z is relatively simpler, but HM3 Surf is needed. At the shore where Salty Sam waits, surf to the opposite isle and enter the bay to get Waterium Z.


S.S. Tess

The boat, with "Tess" marked on it, crashed onto the island.

Following the shoreline behind Salty Sam after landing, a site of a shipwreck can be found, with a white boat left stranded after the crash. An Adventurer from the team of researchers also mentions that this ship seems to be abandoned here for a long time, and he would hardly expect any survivors. Looking closely, the ship actually has "Tess" marked on it. Could this be a clue that explains the mysterious disappearance of Rival Tess' long gone parents?


Wild Pokémon

Note: Rarity levels are estimations according to this scale and might be subject to changes due to different encounter assessment results, unless supported by official encounter rates, which are listed in red under the rarity level if known. If there are any Pokémon with low catch rates, the possibility to flee or requirement of gaining happiness to evolve, recommended Poké Balls for that Pokémon will be shown with the corresponding bag sprite under the Pokémon's name.

Pokémon Type Image Rarity Items EV Yield
Grass Patches Tall Grass Lv. 20-30
Yungoos SM
CommonPecha Berry1 Atk
Pikipek SM
UncommonOran Berry1 Atk
Alola Form
Rattata-Alola SM
UncommonPecha BerryChilan Berry1 Speed
Grubbin SM
RareNone1 Atk
Rockruff SM
Very Rare
None1 Atk
Fishing Old Rod Old Rod Lv. 10
Tentacool XY
CommonPoison Barb1 Sp. Def
Finneon-M XY
Finneon-F XY
UncommonNone1 Speed
Fishing Good Rod Good Rod Lv. 20
Tentacruel XY
CommonPoison Barb2 Sp. Def
Lumineon-M XY
Lumineon-F XY
UncommonNone2 Speed
Tentacool XY
RarePoison Barb1 Sp. Def
Mareanie SM
Very Rare
Poison Barb1 Def
Water HM Water Surf Lv. 20-30
Tentacruel XY
CommonPoison Barb2 Sp. Def
Tentacool XY
UncommonPoison Barb1 Sp. Def
Lumineon-M XY
Lumineon-F XY
UncommonNone2 Speed
Quick BallNet BallTimer Ball
Corsola XY
RareLuminous Moss1 Def
Click on the Pokémon names to check their learnsets on Bulbapedia. All Pokémon follow their movesets in Pokémon Sun and Moon. Hover on the item sprites to check the exact chance of being held by the Wild Pokémon. All information above only applies to the Normal Adventure Mode.

Roaming Pokémon are not listed in the table above. They are fixed at Lv. 40 and have a 0.1% chance of appearing anywhere in Roria with wild encounter methods specified here.


State Item Obtaining Location
Z-Crystal PouchGiven by the female Paleontologist.
Requires Z-Crystal Pouch
Grassium Z
Grassium ZOn high ground accessible by a cave passage near the shipwreck.
Firium Z
Firium ZInside a volcanic chamber on the centre of the larger island.
Waterium Z
Waterium ZInside a cove within the smaller island.
There was no change to the above items between any of the updates.


  • Instead of evolving into Kantonian final forms, Pikachu, Cubone and Exeggcute evolve into Alolan Raichu, Marowak and Exeggutor by using a Thunder Stone, reaching Lv. 28 or above overnight, and using a Leaf Stone respectively when the player is on Lost Islands.
  • While the Paleontologist says that using a Z-Move will drain energy from the player's bracelet, the player actually possesses neither Mega Bracelet nor Z-Ring. She only gives a new Z-Crystal Pouch to the player's bag instead of actually giving the player a Z-Ring.
    • Although the player never obtains a Z-Ring, Z-Crystals still work on Pokémon perfectly fine.
  • The Paleontologist says that the Z-Crystals are guarded by some strong Pokémon, referencing to the Totem Pokémon.
    • However, all Z-Crystals that are available currently are left unguarded.
  • The music on Lost Islands was based on Hoenn Safari Zone theme from the core series game Pokémon Ruby, Sapphire and Emerald.
Towns Mitis TownCheshma TownLagoona Lake (Trenches) • Port Decca (Beach) • Crescent TownHaunted Badge
Cities Silvent CityArc BadgeBrimber CityBrimstone BadgeRosecove CityFloat Badge (Beach) • Anthian City (Housing Dist.Shopping Dist.Battle Dist.Soaring BadgeParkSewer) • Aredia CityCrater Badge (Old ArediaAredia Ruins) • Fluoruma CityHarvest BadgeFrostveil CityContrast Badge (Catacombs)
Routes 123456789101112131415161718
Caves &
Glistening GrottoSteam ChamberMt. Igneus (Igneus Depths) • Path of TruthSilver CoveMt. Cragonos (MinesCliffsPeakSanctuarySpringChamber of the Jewel) • Desert CatacombsNature's DenCalcite ChamberMartensite ChamberDendrite ChamberTitans' ThrongFreezing FissureOcean's OriginAborille Outpost (Demon's Tomb)
Islands Crescent Island (TownAborille Outpost) • Lost Islands (Deep Jungle) • Voltridia Island (Cavern) • Frigidia Island (Cavern) • Obsidia Island (Cavern)
Gale ForestOld GraveyardSecret GroveGrove of DreamsFortulose ManorCosmeos Valley (Observatory) • Tinbell Tower (Construction Site) • Secret LabSafari ZoneEclipse BaseGene Lab
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