Pokémon

A map with all Mirelands encounters can be found here. That page also contains details about spawn rates and levels. The table below just shows a quick overview of the Pokémon that can be found here.

Ground

	Bidoof		Bibarel		Zubat		Golbat		Kricketot		Kricketune
	Geodude		Graveler		Paras		Parasect		Pichu		Pikachu
	Psyduck		Golduck		Combee		Vespiquen		Budew		Roselia
	Carnivine		Petilil		Tangela		Croagunk		Toxicroak		Ralts
	Kirlia		Yanma		Hippopotas		Hippowdon		Pachirisu		Stunky
	Skuntank		Teddiursa		Ursaring		Goomy		Onix		Rhyhorn
	Bonsly		Sudowoodo		Lickitung		Togepi		Turtwig		Grotle
	Gastly		Haunter		Spiritomb		Murkrow		Unown

Water

Barboach

Whiscash

Air

Togetic

Shaking trees

Burmy (Sand)

Wormadam (Sand)

Cherubi

Cherrim

Combee

Vespiquen

Pachirisu

Shaking ores

Geodude

Graveler

Bonsly

Static alphas

	Raichu		Vespiquen		Roserade		Carnivine		Tangrowth		Whiscash
	Toxicroak		Yanmega		Hippowdon		Pachirisu		Skuntank		Ursaring
	Sliggoo		Onix		Rhyhorn		Lickilicky		Torterra		Honchkrow

Special encounters

Pokémon		Level	Area	Circumstances
	Ursaluna	26	Sludge Mound	Required battle during Mission 8: Arezu's Predicament. It must be defeated.
	Lilligant	30	Brava Arena	Required noble battle during Mission 8: Arezu's Predicament.
	Alpha Overqwil	58	Valor Cavern	Required battle during Mission 15: The Trial of Lake Valor. It can be captured or defeated.
	Azelf	70	Valor Cavern	Required catch to complete Mission 21: The Plate of the Lakes.
	Spiritomb	60	Shrouded Ruins	Appears after completing Request 22: Eerie Apparitions.
	Stunky (3x)	20	Sludge Mound	Required battle to complete Request 31: Setting Up the Bogbound Camp. They can be captured or defeated.
	Sudowoodo	26	Bogbound Camp	Required battle to complete Request 36: Watering with Care. It must be defeated.
	Hippowdon	34	Verity Cavern	Required battle to complete Request 40: The Charm Lost in the Swamp. It can be captured or defeated.
	Enamorus	70	Horseshoe Plains	Required catch to complete Request 94: Incarnate Forces of Hisui.
	Lilligant	70	Brava Arena	Optional noble rematch.

Space-time distortions

For more details on spawn rates and levels, see this page.

	Cyndaquil		Quilava		Typhlosion		Luxio		Luxray		Eevee
	Flareon		Umbreon		Drifblim		Floatzel		Snorlax		Lopunny
	Heracross		Porygon		Porygon2		Porygon-Z

Mass outbreaks

For more details on spawn rates and levels, see this page.

	Kricketot		Kricketune		Geodude		Graveler		Paras		Parasect
	Psyduck		Golduck		Combee		Happiny		Chansey		Budew
	Roselia		Carnivine		Petilil		Tangela		Tangrowth		Barboach
	Whiscash		Croagunk		Toxicroak		Yanma		Yanmega		Hippopotas
	Hippowdon		Pachirisu		Stunky		Skuntank		Teddiursa		Ursaring
	Goomy		Sliggoo		Rhyhorn		Rhydon		Bonsly		Sudowoodo
	Lickitung		Lickilicky		Togepi		Turtwig		Grotle		Gastly
	Haunter		Murkrow

Massive mass outbreaks

For more details on spawn rates and levels, see this page. The list below includes both the base species that can appear in mass outbreaks and their evolved forms, since evolved forms can appear as part of an outbreak or an extra wave.

These can only be found if the player has the free Daybreak update.

	Cyndaquil		Quilava		Typhlosion		Kricketot		Kricketune		Paras
	Parasect		Psyduck		Golduck		Budew		Roselia		Roserade
	Carnivine		Petilil		Lilligant		Tangela		Tangrowth		Croagunk
	Toxicroak		Yanma		Yanmega		Hippopotas		Hippowdon		Pachirisu
	Stunky		Skuntank		Teddiursa		Ursaring		Ursaluna		Goomy
	Sliggoo		Goodra		Onix		Steelix		Rhyhorn		Rhydon
	Rhyperior		Bonsly		Sudowoodo		Lickitung		Lickilicky		Turtwig
	Grotle		Torterra		Gastly		Haunter		Gengar		Spiritomb
	Murkrow		Honchkrow		Unown		Skorupi		Drapion		Bronzor
	Bronzong		Swinub		Piloswine

Items

Overworld

Medicinal Leek	Vivichoke	King's Leaf	Dazzling Honey	Hearty Grains
Wood	Bugwort	Pep-Up Plant	Sootfoot Root	Caster Fern
Springy Mushroom	Swordcap	Iron Barktongue	Direshroom	Iron Chunk

Trees

This map shows the locations of all trees that be attacked and the items they can drop.

Apricorn	Spoiled Apricorn	Oran Berry	Sitrus Berry	Chesto Berry
Pecha Berry	Aspear Berry	Leppa Berry	Razz Berry	Hopo Berry

Ores

This map shows the locations of all ores that be attacked and the items they can drop.

Tumblestone	Black Tumblestone	Sky Tumblestone	Iron Chunk
Stardust	Water Stone	Fire Stone	Thunder Stone

Hay piles

This map shows the locations of all hay piles that be attacked and the items they can drop.

Medicinal Leek

Vivichoke

Hearty Grains

Sootfoot Root

Caster Fern

Leaf piles

This map shows the locations of all leaf piles that be attacked and the items they can drop.

Spoiled Apricorn

Dazzling Honey

Springy Mushroom

Plump Beans

King's Leaf

Leaf Stone

Space-time distortions

Exact appearance rates can be found on the space-time distortions page.

Blue Shard	Red Shard	Green Shard	Stardust	Star Piece	Nugget
Comet Shard	Upgrade	Dubious Disc	Electirizer	Magmarizer	Protector
Linking Cord	Water Stone	Fire Stone	Thunder Stone	Leaf Stone	Moon Stone
Sun Stone	Dusk Stone	Shiny Stone	Dawn Stone	Ice Stone

Ursaluna

The following items can be found by digging with Ursaluna with the specified rates.

Item	Rate
Ball of Mud	20%
Iron Chunk	14%
Candy Truffle	12%
Hearty Grains	12%
Star Piece	10%
Peat Block	7%
Sun Stone	5%
Moon Stone	5%
Tumblestone	4%
Black Tumblestone	4%
Sky Tumblestone	4%
Black Augurite	3%

Camp shops

The items sold here are the same as those sold in the general store in Jubilife Village, and require the same requests to be completed to expand the inventory.

Camp Shops

Item	Price	Progression requirement
Poké Ball	100	N/A
Great Ball	300	After completing Request 43: More New Wares
Ultra Ball	600	After completing Request 71: New Wares Yet Again
Heavy Ball	120	After completing Request 23: Getting Ahold of New Wares
Leaden Ball	320	After completing Request 61: Even More New Wares
Feather Ball	140	After completing Request 23: Getting Ahold of New Wares
Wing Ball	340	After completing Request 61: Even More New Wares
Potion	200	N/A
Super Potion	400	After completing Request 23: Getting Ahold of New Wares
Hyper Potion	800	After completing Request 43: More New Wares
Max Potion	2000	After completing Request 61: Even More New Wares
Full Restore	2500	After completing Request 71: New Wares Yet Again
Full Heal	600	After completing Request 43: More New Wares
Revive	700	N/A
Max Revive	3000	After completing Request 71: New Wares Yet Again
Stealth Spray	800	After completing Request 43: More New Wares
Sticky Glob	800	After completing Request 71: New Wares Yet Again
Smoke Bomb	400	After completing Request 23: Getting Ahold of New Wares
Scatter Bang	500	After completing Request 43: More New Wares
Mushroom Cake	400	After completing Request 23: Getting Ahold of New Wares
Honey Cake	400	After completing Request 23: Getting Ahold of New Wares
Grain Cake	400	After completing Request 43: More New Wares
Bean Cake	400	After completing Request 61: Even More New Wares
Salt Cake	400	After completing Request 71: New Wares Yet Again
Cake-Lure Base	100	N/A

Obtained as part of the story

Item	Mission	Location	Details
Wall Fragment	Mission 8: Arezu's Predicament	Golden Lowlands	Obtained from the Miss Fortunes after defeating Coin
Earth Plate	Mission 8: Arezu's Predicament	Sludge Mound	Obtained from Ursaluna after defeating it
Unown Notes	Mission 8: Arezu's Predicament	Any camp	Obtained from Professor Laventon for the Pokédex after defeating Coin
Marsh Balms	Mission 8: Arezu's Predicament	Brava Arena	Obtained before battling Lilligant
Meadow Plate	Mission 8: Arezu's Predicament	Brava Arena	Obtained from Lilligant after quelling it
Azelf's Fang	Mission 15: The Trial of Lake Valor	Valor Cavern	Obtained from Azelf after completing its trial
Red Chain	Mission 16: The Trial of Lake Acuity	Shrouded Ruins	Obtained from the emotion Pokémon after completing Missions 14-16
Draco Plate	Mission 21: The Plate of the Lakes	Valor Cavern	Obtained from Azelf if it is the third of the emotion Pokémon to be caught

Other

Item	Location	Details
Aguav Berry (20x)	Any camp	Obtained from Melli during Request 97: Massive Mass Outbreak in the Mirelands 5 are eaten by Munchlax.
Adamant Crystal	Lake Valor	Obtained from Adaman during Request 89: The Diamond Clan's Treasure
Old Gateau recipe	Northwest of the pond west of Brava Arena	Obtained from Taeko
Exp. Candy M (3x)	Brava Arena	Reward from Calaba for defeating Lilligant in a rematch
Exp. Candy L	Brava Arena	Reward from Calaba for defeating Lilligant in a rematch without taking damage

Trainers

Trainer	Party	Location	Notes
Volo	Togepi lv.22 Gible lv.22	Solaceon Ruins	During Mission 8: Arezu's Predicament
Coin	Toxicroak lv.23	Golden Lowlands	During Mission 8: Arezu's Predicament
Adaman	Leafeon lv.64 Umbreon lv.32 Vaporeon lv.32	Lake Valor	During Request 89: The Diamond Clan's Treasure
Ren	Ursaring lv.30	Mirelands camp	During Request 35: Battling with Pachirisu
Irida	Glaceon lv.65 Espeon lv.34 Flareon lv.34	Diamond Settlement	During Request 107: Irida's Wish The player can only use Origin Forme Palkia for this battle.

Miss Fortunes

The Miss Fortunes may occasionally be present around Crimson Mirelands and can be battled. Per Bulbapedia, all three members' teams can be various levels depending on the player's progress through the story. However, I am not sure if it is possible to see all these levels; the earliest I have heard about them being present is during the red sky event between Missions 13 and 18. If you have any information about when they begin to show up, please contact me.

Trainer	Party	Potential levels
Charm	Rhydon Gengar	Rhydon: 37, 40, 43, 46, 49, 52, 55, 58, 61, 64 Gengar: 38, 41, 44, 47, 50, 53, 56, 59, 62, 65
Clover	Abomasnow	38, 41, 44, 47, 50, 53, 56, 59, 62, 65
Coin	Toxicroak	40, 43, 46, 49, 52, 58, 61, 64

After defeating one of them, you will receive some valuable items. I have only gotten 4 Nuggets, but apparently 5 Nuggets and some amount of Stardust are possible. Again, please contact me if you know more.