|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.
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.
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?
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.
|Grass Patches||Tall Grass||Lv. 20-30|
|Fishing||Old Rod||Lv. 10|
|Tentacool||Common||1 Sp. Def|
|Fishing||Good Rod||Lv. 20|
|Tentacruel||Common||2 Sp. Def|
|Tentacool||Rare||1 Sp. Def|
|Tentacruel||Common||2 Sp. Def|
|Tentacool||Uncommon||1 Sp. 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.|
|Z-Crystal Pouch||Given by the female Paleontologist.|
|Requires Z-Crystal Pouch|
|Grassium Z||On high ground accessible by a cave passage near the shipwreck.|
|Firium Z||Inside a volcanic chamber on the centre of the larger island.|
|Waterium Z||Inside 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.
- There is a map engraved on stone showing a door on the side of the volcano where the Firium Z is found.