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The Lagoona Trenches is where underwater mining takes place. Located at the bottom of Lagoona Lake, this place is only accessible from the Underwater Mining Vessel in the Lagoona Research Lab. Players can find a vast and varied amount of items hidden deep within undersea rocks. These treasures consist of fossils, Evolutionary Stones, and other rare commodities, such as Heart Scales and Rare Bones.

Underwater Mining Vessel

The Underwater Mining Vessel is a small, yellow submarine that the player must operate in order to access the Lagoona Trenches. Talk to the blonde female scientist in the centre of Lagoona Lab and use an UMV Battery in order to activate the UMV and dive underwater. The first time the player arrives in Lagoona Lab, the blonde scientist will offer the player a free UMV Battery. When underwater, the right bar indicates the battery status of UMV Submarine. Driving around and mining causes the battery to deplete, and when the bar is empty, the player surfaces and is sent back to the Lagoona Lab. If the player has run out of batteries, he or she will either have to win a UMV Battery from Hobo's Lucky Lotto as a prize or buy more with Robux from the same blonde scientist in the following packs:

Batteries Selling price (Robux) Price per battery Discount
1 5 5 None
3 11 Approximately 3.67 Appr. 27% off
6 18 3 40% off

Note: The player is required to save before mining. This is to prevent players from using the free battery from trying again and again to get the items they want. If the game crashes or is suddenly disconnected, the player, unfortunately, cannot try again.

Mining

The mining process is nearly identical to Sinnoh Underground in the core series games Pokémon Diamond, Pearl and Platinum, only with hammer switched for dynamites, and the pick changed to a drill. Find and click on sparkling parts of the wall to start mining. Like in real games, if the wall sustains too much damage before treasures are all dug out, it will collapse, destroying all treasures that are not retrieved in time. There is a green bar on the top to show how much damage the wall has sustained, and the player must dig out as many items as possible before the bar fills up.

Each time the player mines, the number of items ranges between 1 to 4 inclusively. The treasures found are also similar to those in Sinnoh Underground, meaning that Fossils, Shards, Plates, certain kinds of Evolutionary Stones and some rare items can be found, but with the following changes:

  • The 4 fossils found in Unova and Kalos are also added.
  • All kinds of spheres are removed.
  • The Pixie Plate is added.
  • New Fossilized Eggs are added. They can yield unique and rare Pokémon, including the Legendary Lake Guardians.

Treasures

Fossil Pokémon

Certain ancient Pokémon Fossils can be found within undersea rocks. Take these Fossils to the back of Lagoona Lab, and talk to the male scientist near the Fossil Revival machine to reap the benefits of one's spoils. They are automatically set to Lv. 10 upon revival. These fossils can also be traded to other Pokémon trainers when given to a Pokémon to hold. While having more Pokémon can always be beneficial, once the player collects them all, he or she should consider holding onto the rest in case he or she has a fossil others are looking for.

FossilPokémon / TypeImageEvolving LevelEvolved Form / TypeImage
Kanto Fossil Pokémon
Helix Fossil Mining
Helix Fossil
Omanyte
Rock
Water
Omanyte XY Lv. 40 Omastar
Rock
Water
Omastar XY
Dome Fossil Mining
Dome Fossil
Kabuto
Rock
Water
Kabuto XY Kabutops
Rock
Water
Kabutops XY
Old Amber Mining
Old Amber
Aerodactyl
Rock
Flying
Aerodactyl XY N/A
Hoenn Fossil Pokémon
Root Fossil Mining
Root Fossil
Lileep
Rock
Grass
Lileep XY Lv. 40 Cradily
Rock
Grass
Cradily XY
Claw Fossil Mining
Claw Fossil
Anorith
Rock
Bug
Anorith XY Armaldo
Rock
Bug
Armaldo XY
Sinnoh Fossil Pokémon
Skull Fossil Mining
Skull Fossil
Cranidos
Rock
Cranidos XY Lv. 30 Rampardos
Rock
Rampardos XY
Armour Fossil Mining
Armour Fossil
Shieldon
Rock
Steel
Shieldon XY Bastiodon
Rock
Steel
Bastiodon XY
Unova Fossil Pokémon
Cover Fossil DW
Cover Fossil
Tirtouga
Water
Rock
Tirtouga XY Lv. 37 Carracosta
Water
Rock
Carracosta XY
Plume Fossil DW
Plume Fossil
Archen
Rock
Flying
Archen XY Archeops
Rock
Flying
Archeops XY
Kalos Fossil Pokémon
Jaw Fossil DW
Jaw Fossil
Tyrunt
Rock
Dragon
Tyrunt XY Lv. 39
Daytime Only
Tyrantrum
Rock
Dragon
Tyrantrum XY
Sail Fossil DW
Sail Fossil
Amaura
Rock
Ice
Amaura XY Lv. 39
Overnight Only
Aurorus
Rock
Ice
Aurorus XY

Fossilized Eggs

Fossilegg

The Fossilized Egg in mining.

Different from normal fossils, these Pokémon are hatched from revived Fossilized Eggs found in underwater mining. The Fossilized Eggs are unique to this game. They are stored in the player's party or PC instead of his or her bag. The resurrection process is similar to other fossils — the player must take the Fossilized Eggs to the back of Lagoona Lake Lab and talk to the male scientist for revival. Note that soft resetting does not alter the result. Obtained from Fossilized Eggs, the Lake Guardians Uxie, Mespirit and Azelf are the only Legendary Pokémon available in eggs.

Fossileggprof

The profile of a Fossilized Egg. It requires revival in the Research Lab before hatching.

PokémonTypeImageEggRarity
Togepi Fairy
Togepi XY
Togepi Egg
85%
Uxie Psychic
Uxie XY
Uxie Egg
5%
Mesprit Psychic
Mesprit XY
Mesprit Egg
5%
Azelf Psychic
Azelf XY
Azelf Egg
5%

Evolutionary Stones

Also found underwater are various Evolutionary Stones that can be used on specific Pokémon to help them evolve. With the exception of Oval Stone, all stones listed below are directly used on Pokémon to trigger evolution.

StoneImageStoneImage
Fire Stone
Fire Stone Mining
Water Stone
Water Stone Mining
Thunder Stone
Thunder Stone Mining
Leaf Stone
Leaf Stone Mining
Sun Stone
Sun Stone Mining
Moon Stone
Moon Stone Mining
Oval Stone
Oval Stone Mining

Other Treasures

There are a handful of other items that can be found via underwater mining. The rarity of these spoils varies.

ItemImageUsageRarity
Revive
Revive Mining
Restores a fainted Pokémon's health by half upon usage. Rare
Max Revive
Max Revive Mining
Completely restores a fainted Pokémon's health upon usage. Very Rare
Everstone
Everstone Mining
Prevents all kinds of evolution once held.
If held by either parent in Day Care, holder's nature will be passed down to the bred Pokémon.
Uncommon
Plates
Iron Plate DW
Increase the damage of attacks from the corresponding type by 20% if held.
Changes Arceus' type when held by it.
Rare
Light Clay
Light Clay Mining
Extend the effect of Reflect and Light Screen by 3 more turns once held, if not broken by Brick Break or blown away by Defog. Uncommon
Star Piece
Star Piece Mining
Sell for 4900 dollars. Rare
Rare Bone
Rare Bone Mining
Sell for 5000 dollars. Rare
Shards
  • Red Shard
  • Blue Shard
  • Yellow Shard
  • Green Shard
N/A (Possible for paying Move Tutors later on) Common
Iron Ball
Iron Ball Mining
Reduces speed when held and, if the holder belongs to Flying-type or has the ability Levitate, eliminates immunity to Ground-type attacks. When thrown by the move Fling, this item causes the most damage. Uncommon
Heart Scale
Heart Scale Mining
Pay the Move Reminder in Battle Colosseum for remembering forgotten moves. Very Rare
Hard Stone
Hard Stone Mining
Increases the damage of Rock-type attacks by 20% when held. Common
Heat / Damp / Icy / Smooth Rock
  • Heat Rock
  • Damp Rock
  • Icy Rock
  • Smooth Rock
Extend the duration of corresponding weather moves and abilities by 3 more turns when held. For example, Heat Rock extends the effect of Sunny Day and ability Drought to 8 turns. Rare
Odd Keystone
Odd Keystone Mining
Throw into the Old Well on Route 8 to summon the Pokémon Spiritomb. Very Rare

Trivia

  • As surprising as it may seem, Pokémon Eggs can actually be hatched underwater.
  • Some underwater treasures are very rare and have a very high value to other trainers, who might be willing to trade for them at the Trade Resort.
  • The music in Lagoona Trenches is based on Through the Sea of TIme from the side series game Pokémon Mystery Dungeon: Explorers of Time, Darkness & Sky. This remix theme is made by famous music remix creator GlitchxCity.


Roria
Roria
Towns Mitis TownCheshma TownLagoona Lake (Trenches) • Port Decca
Cities Silvent CityBrimber CityRosecove City (Beach) • Anthian City (Housing Dist.Shopping Dist.Battle Dist.ParkSewer) • Aredia City (Old ArediaAredia Ruins) • Fluoruma CityFrostveil City (Catacombs)
Routes 12345678910111213141516
Caves &
Mountains
Glistening GrottoSteam ChamberMt. Igneus (Igneus Depths) • Path of TruthSilver CoveMt. Cragonos (MinesCliffsPeakSanctuarySpringChamber of the Jewel) • Desert CatacombsNature's DenCalcite ChamberMartensite ChamberDendrite ChamberTitans' ThrongFreezing Fissure
Islands Lost Islands (Deep Jungle)
Other
Locations
Gale ForestOld GraveyardSecret GroveGrove of DreamsFortulose ManorCosmeos Valley (Observatory) • Tinbell Tower (Construction Site) • Secret Lab