This article contains spoilers!

Obsidia Cavern is a seemingly-active volcano located on Obsidia Island — an outlying isle only reached through the Double Decca. Located off the coast of Roria, it is too far out to be seen on the Roria Town Map. Being a smaller version of Mt. Igneus, this volcano has a spacious interior and there is an elevated area where the player can encounter Legendary Pokémon Moltres, lying in wait on top.

Notable Events

Catching Moltres

VS Moltres

Moltres on the highest platform near a "lava-fall" in Obsidia Cavern.

As the player enters the cavern, he or she will be able to spot a tall rock structure. In the centre of this rock structure, Moltres can be seen waiting for the player on the topmost platform. The player must climb the slope that wraps around the tall rock structure to encounter Moltres. The player only has 1 chance to catch Moltres, so save beforehand and turn off Autosave. Moltres is very difficult to catch, so the player is recommended to buy a lot of Dusk Balls from Poké Ball Emporium before proceeding for the battle.


Wild Pokémon

Note: Rarity levels are estimations according to this scale and might be subject to changes due to different encounter assessment results. 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
Walking Cave Lv. 29-37
Slugma XY
CommonNone1 Sp. Atk
Numel-M XY
Numel-F XY
UncommonNone1 Sp. Atk
Camerupt-M XY
Camerupt-F XY
RareNone1 Atk
1 Sp. Atk
Quick BallDusk BallTimer Ball
Turtonator SM
Very RareCharcoal2 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.

Set Encounter

Warning: Players can only battle the following Pokémon once! Save beforehand and turn off Autosave.

Pokémon Type Level Image Rarity Item EV Yield
Legendary Pokémon
Quick BallDusk BallTimer Ball
Lv. 50
Moltres XY
One OnlyNone3 Sp. Atk
If attempts of catching the above Pokémon failed, immediately leave the game and rejoin without saving, in order to secure a second chance.

Click on the Pokémon names to check their learnsets on Bulbapedia. All Pokémon above follow their movesets in Pokémon Sun and Moon. Hover on the item sprites to check the exact chance of being held by the Set Encounter Pokémon.


State Item Obtaining Location
Gold Item Ball
TM Fire
TM38 Fire
Fire Blast
At the topmost platform with Moltres, behind some rocks near the edge.
There was no change to the above items between any of the updates.


  • Obsidia Cavern is possibly a reference to Faldera Volcano, Oblivia in Pokémon Ranger: Guardian Signs. Both are active volcanoes on offshore islands and feature Moltres in the summit craters.
  • The name of this cavern is derived from obsidian, which is a kind of naturally-occurring volcanic glass formed as an extrusive igneous rock.
  • Both this area and Mt. Igneus are also home to Legendary Pokémon, with Groudon residing in the summit crater of Mt. Igneus and Heatran living in the deepest part of Igneus Depths.
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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