Pokémon

A map with all Coastlands 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

	Bibarel		Starly		Staravia		Staraptor		Beautifly		Dustox
	Eevee		Drifloon		Drifblim		Buizel		Floatzel		Mothim
	Graveler		Stantler		Paras		Parasect		Pikachu		Psyduck
	Golduck		Combee		Aipom		Ambipom		Shellos (East)		Gastrodon (East)
	Happiny		Chansey		Tangela		Toxicroak		Togepi		Togetic
	Murkrow		Spheal		Sealeo		Walrein		Octillery (& Seaside Hollow)		Skorupi
	Growlithe		Glameow		Purugly		Machop		Machoke		Chatot
	Duskull		Dusclops		Piplup		Prinplup		Vulpix (Kantonian)		Magby
	Magmar		Phione (Seaside Hollow)

Water

	Drifloon		Drifblim		Gyarados		Qwilfish		Remoraid		Mantyke
	Mantine		Basculin		Tentacool		Tentacruel		Finneon		Lumineon

Air

Staraptor

Honchkrow

Shaking trees

Burmy (Trash)

Wormadam (Trash)

Combee

Aipom

Shaking ores

Geodude

Graveler

Static alphas

	Mothim		Golduck		Ambipom		Gyarados		Gastrodon (East)		Qwilfish
	Chansey		Walrein		Octillery		Drapion		Purugly		Machoke
	Dusknoir		Empoleon		Mantine		Ninetales (Kantonian)		Tentacruel		Lumineon

Special encounters

Pokémon		Level	Area	Circumstances
	Arcanine	36	Molten Arena	Required noble battle during Mission 10: The Lordless Island.
	Heatran	70	Lava Dome Sanctum	Required catch to complete Mission 22: The Plate of Firespit Island.
	Chatot	34	Sand's Reach	Required battle during Request 46: Setting Up the Coastlands Camp. It can be captured or defeated.
	Aipom (2x)	30	Windbreak Stand	Required battle to complete Request 49: Keep an Eye Out for Aipom!. They must be defeated.
	Manaphy	50	Seaside Hollow	Required catch to complete Request 66: The Sea's Legend.
	Phione (3x)	33-36	Seaside Hollow	Required battle to complete Request 66: The Sea's Legend. They can be captured or defeated.
	Giratina	70	Turnback Cave	Required catch to complete Request 91: On the Trail of Giratina.
	Thundurus	70	In the water north of Sand's Reach	Required catch to complete Request 94: Incarnate Forces of Hisui.
	Arcanine	70	Molten Arena	Optional noble rematch.

Space-time distortions

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

Eevee

Vaporeon

Flareon

Kadabra

Alakazam

Mr. Mime

Carnivine

Skuntank

Rhydon

Rhyperior

Magnemite

Magneton

Magnezone

Mass outbreaks

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

	Starly		Staravia		Staraptor		Drifloon		Drifblim		Buizel
	Floatzel		Aipom		Ambipom		Shellos (East)		Gastrodon (East)		Qwilfish
	Happiny		Chansey		Tangela		Tangrowth		Togepi		Spheal
	Sealeo		Walrein		Remoraid		Octillery		Skorupi		Drapion
	Growlithe		Glameow		Purugly		Machop		Machoke		Chatot
	Duskull		Dusclops		Piplup		Prinplup		Mantyke		Mantine
	Basculin		Vulpix		Tentacool		Tentacruel		Finneon		Lumineon
	Magby		Magmar

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.

	Starly		Staravia		Staraptor		Geodude		Graveler		Golem
	Psyduck		Golduck		Aipom		Ambipom		Magikarp		Gyarados
	Shellos (East)		Gastrodon (East)		Qwilfish		Overqwil		Happiny		Chansey
	Blissey		Onix		Steelix		Togepi		Togetic		Togekiss
	Spheal		Sealeo		Walrein		Skorupi		Drapion		Growlithe
	Arcanine		Glameow		Purugly		Machop		Machoke		Machamp
	Chatot		Piplup		Prinplup		Empoleon		Mantyke		Mantine
	Basculin		Basculegion		Vulpix (Kantonian)		Ninetales (Kantonian)		Tentacool		Tentacruel
	Finneon		Lumineon		Magby		Magmar		Magmortar		Cleffa
	Clefairy		Riolu		Lucario

Items

Overworld

Balls of Mud can be found in Lava Dome Sanctum.

Medicinal Leek	Vivichoke	King's Leaf	Dazzling Honey	Plump Beans
Wood	Bugwort	Pep-Up Plant	Pop Pod	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	Rawst Berry
Pecha Berry	Leppa Berry	Nanab Berry	Razz Berry	Pinap 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

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

Chests

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

Poké Ball	Great Ball	Ultra Ball	Bean Cake	Salt Cake
Sticky Glob	Stealth Spray	Smoke Bomb	Scatter Bang	Nugget

Boxes

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

Poké Ball	Great Ball	Ultra Ball	Mushroom Cake	Honey Cake
Grain Cake	Sticky Glob	Smoke Bomb	Scatter Bang

Space-time distortions

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

Green Shard	Red Shard	Blue 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%
Plump Beans	12%
Star Piece	10%
Sun Stone	7%
Black Augurite	7%
Tumblestone	4%
Black Tumblestone	4%
Sky Tumblestone	4%
Moon Stone	3%
Peat Block	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
Basculegion Food	Mission 10: The Lordless Island	Aipom Hill (Iscan's house)	Obtained from Iscan after bringing him a Dusclops
Splash Plate	Mission 10: The Lordless Island	Ginkgo Landing	Obtained from Basculegion after obtaining it as a rideable Pokémon
Volcano Balms	Mission 10: The Lordless Island	Molten Arena	Obtained before battling Arcanine
Flame Plate	Mission 10: The Lordless Island	Molten Arena	Obtained from Arcanine after quelling it
Iron Plate	Mission 22: The Plate of Firespit Island	Lava Dome Sanctum	Obtained after catching Heatran

Other

Item	Location	Details
Griseous Core	Turnback Cave	Obtained after catching Giratina during Request 91: On the Trail of Giratina
Exp. Candy M (3x)	Molten Arena	Reward from Palina for defeating Arcanine in a rematch
Exp. Candy L	Molten Arena	Reward from Palina for defeating Arcanine in a rematch without taking damage

The player can get rewards for bursting balloons in the balloon minigame at the Coastlands camp. If you have information about exactly what items can be received this way, please contact me.

Trainers

Trainer	Party	Location	Notes
Irida	Glaceon lv.30 Eevee lv.15	Beachside camp	During Mission 10: The Lordless Island
Clover	Abomasnow lv.35	Firespit Island	During Mission 10: The Lordless Island
Coin	Toxicroak lv.34	Firespit Island	During Mission 10: The Lordless Island
Charm	Rhydon lv.34 Gengar lv.35	Firespit Island	During Mission 10: The Lordless Island
Rei/Akari	Clefairy lv.60 Pikachu lv.62 Staraptor lv.61 Mr. Mime lv.61 Sinnoh starter (2nd stage) lv.62	Ginkgo Landing	During Request 98: Massive Mass Outbreak in the Coastlands Their Sinnoh starter is the one whose primary type is weak to that of the player's chosen Hisui starter.
Adaman	Leafeon lv.65 Umbreon lv.34 Vaporeon lv.34	Ginkgo Landing	During Request 106: Adaman's Hope The player can only use Origin Forme Dialga for this battle.

Miss Fortunes

The Miss Fortunes may occasionally be present around Cobalt Coastlands 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.