Walkthrough: After completing your final Grand Trial with Kahuna Hapu, you will gain access to Vast Poni Canyon. The Canyon is a very large area, with many strong Wild Pokemon and Trainers found throughout; it's almost as big as Poni Plains and Hau'oli City. It also houses the final Island Trial within, as well as provides electric fields for Magneton, Nosepass, and Charjabug to evolve into Magnezone, Probopass and Vikavolt, respectively.
Wild Pokemon:
Initial Pokemon (Levels 41-44): Boldore(30%), Golbat(30%), Carbink(20%), Dugtrio(20%)
SOS Pokemon #1 (Levels 41-44): Boldore, Golbat, Sableye, Dugtrio
Initial Pokemon - Daytime (Levels 41-44): Machoke(30%), Midday Lycanroc(20%), Carbink(15%), Murkrow(10%), Boldore(10%), Skarmory(10%), Jangmo-o(5%)
SOS Pokemon #1 - Daytime (Levels 41-44): Machoke, Midday Lycanroc, Carbink, Murkrow, Boldore, Skarmory, Kommo-o
SOS Pokemon #2 - Daytime (Levels 41-44): Machoke, Midday Lycanroc, Carbink, Murkrow, Boldore, Skarmory, Hakamo-o
Initial Pokemon - Nighttime (Levels 41-44): Machoke(30%), Midnight Lycanroc(20%), Carbink(15%), Murkrow(10%), Boldore(10%), Skarmory(10%), Jangmo-o(5%)
SOS Pokemon #1 - Nighttime (Levels 41-44): Machoke, Midnight Lycanroc, Carbink, Murkrow, Boldore, Skarmory, Kommo-o
SOS Pokemon #2 - Nighttime (Levels 41-44): Machoke, Midnight Lycanroc, Carbink, Murkrow, Boldore, Skarmory, Hakamo-o
Initial Pokemon (Levels 41-44): Boldore(30%), Golbat(30%), Carbink(20%), Dugtrio(20%)
SOS Pokemon #1 (Levels 41-44): Boldore, Golbat, Sableye, Dugtrio
Initial Pokemon (Levels 41-44): Boldore(30%), Golbat(30%), Carbink(20%), Dugtrio(20%)
SOS Pokemon #1 (Levels 41-44): Boldore, Golbat, Sableye, Dugtrio
Initial Pokemon (Levels 41-44): Boldore(30%), Golbat(30%), Carbink(20%), Dugtrio(20%)
SOS Pokemon #1 (Levels 41-44): Boldore, Golbat, Sableye, Dugtrio
Rustling Spots (Levels 41-44): Dugtrio(100%)
Initial Pokemon - Daytime (Levels 41-44): Machoke(30%), Midday Lycanroc(20%), Carbink(15%), Murkrow(10%), Boldore(10%), Skarmory(10%), Jangmo-o(5%)
SOS Pokemon #1 - Daytime (Levels 41-44): Machoke, Midday Lycanroc, Carbink, Murkrow, Boldore, Skarmory, Kommo-o
SOS Pokemon #2 - Daytime (Levels 41-44): Machoke, Midday Lycanroc, Carbink, Murkrow, Boldore, Skarmory, Hakamo-o
Initial Pokemon - Nighttime (Levels 41-44): Machoke(30%), Midnight Lycanroc(20%), Carbink(15%), Murkrow(10%), Boldore(10%), Skarmory(10%), Jangmo-o(5%)
SOS Pokemon #1 - Nighttime (Levels 41-44): Machoke, Midnight Lycanroc, Carbink, Murkrow, Boldore, Skarmory, Kommo-o
SOS Pokemon #2 - Nighttime (Levels 41-44): Machoke, Midnight Lycanroc, Carbink, Murkrow, Boldore, Skarmory, Hakamo-o
Initial Pokemon (Levels 41-44): Boldore(30%), Golbat(30%), Carbink(20%), Dugtrio(20%)
SOS Pokemon #1 (Levels 41-44): Boldore, Golbat, Sableye, Dugtrio
Surfing (Levels 41-44): Golbat(80%), Golduck(20%)
Fishing (Levels 10-44): Magikarp(59%), Barboach(40%), Dratini(1%)
Fishing SOS Pokemon #1 (Levels 10-44): Gyarados, Whiscash, Dragonair
Fishing SOS Pokemon #2 (Levels 10-44): Magikarp, Barboach, Dratini
Fishing Bubble Spots (Levels 10-44): Magikarp(50%), Barboach(40%), Dratini(10%)
Fishing Bubble Spots SOS Pokemon #1 (Levels 10-44): Gyarados, Whiscash, Dragonair
Trainers:
Veteran Harry (Inside) - Level 46 Torkoal, Level 46 Arcanine
Backpacker Perdy (Inside) - Level 44 Whimsicott
Ace Trainer Kent (Inside) - Level 46 Sandslash
Ace Trainer Aimee (Inside) - Level 46 Ninetales
Punk Girl Anna (Top) - Level 44 Persian, Level 44 Honchkrow
Punk Guy Adam (Top) - Level 44 Pangoro
Black Belt Earl (Top) - Level 46 Poliwrath
Ace Trainer Hiroshi (Top) - Level 46 Absol, Level 47 Lapras
Veteran Heather (Top) - Level 47 Stoutland, Level 47 Klefki, Level 47 Tsareena
Veteran Eric (Top) - Level 47 Granbull, Level 47 Cloyster, Level 47 Golem, Level 47 Gengar
Hiker Zachary (2nd Floor) - Level 44 Archeops, Level 44 Rampardos
Veteran Lynn (2nd Floor) - Level 46 Starmie, Level 46 Shiinotic, Level 46 Talonflame
Ace Trainer Junko (2nd Floor) - Level 45 Lilligant, Level 46 Weavile
Scientist Ikaika (3rd Floor) - Level 43 Muk, Level 44 Magnezone
Black Belt Terry (Basement) - Level 46 Machamp
Zygarde Cells: There are four Zygarde Cells found scattered through the entire Canyon.
Items:
Groundium Z (Main Area) - Defeat Kahuna Hapu
Max Revive (Main Area) - From Lillie After Defeating Hapu
Max Potion (Main Area) - Near Cave Entrance
Stardust (Inside) - Near Backpacker Perdy
Max Potion (Inside) - Near Backpacker Perdy
Elixir (Inside) - Behind Backpacker Perdy
Nugget (Inside) - In Rock Near Backpacker Perdy (Hidden)
Revive (Top) - South of Cave
TM99 Dazzling Gleam (Top) - Below Ace Trainer Junko
X Sp.Atk (Top) - In Rock Below Ace Trainer Junko
Dusk Ball (Top) - Outside Cave Near Machamp Boulder
Fairium Z (Top) - From Mina
Full Heal (Top) - Southwest of Black Belt Earl
X Attack (Top) - Entrance To 2nd Floor of Canyon (Hidden)
PP Max (Top) - In Rock Up From Trees (Hidden)
Escape Rope (2nd Floor) - Up From Veteran Lynn
Full Restore (2nd Floor Deep) - Left of Machamp Block
X Defense (Under Tree) - Between Rocks (Hidden)
Rare Candy (Basement) - Top Left Island
TM35 Flamethrower (Basement) - Bottom Left Island
TM02 Dragon Claw (Trial Site) - First Crevice
Dragonium Z (Trial Site) - In Pedestal After Trial Completion