Part 6: Byron split
Becomes available here: HM03 - Surf, HM04 - Strength
Byron split opens 34 areas. There are 99 trainers standing in them. The fights at this checkpoint are Commander Jupiter (Fog, Double Battle), Cyrus (Fog), Barry #5 (Player picked Chimchar, on Canalave Bridge), and 3 more.
Where to go
Valor Lakefront
Wild: Rapidash 20% · Lv 47, Staraptor 20% · Lv 47, Arcanine 10% · Lv 47, Girafarig 10% · Lv 47 +9 more
Trainers: Galactic Io Lv 52
Pick up: TM85 Dream Eater, Colbur Berry, Heart Scale, Luxury Ball, Sun Stone, Ultra Ball, White Flute
Fuego Ironworks
Wild: Gulpin 65%, Weezing 60%, Lumineon 45%, Gyarados 40% +23 more
Trainers: Worker Dillan Lv 96, Worker Holden Lv 90, Worker Conrad Lv 90
Pick up: TM35 Flamethrower, Big Mushroom, Each coloured shard, Fire Stone, Green Shard, Red Shard, Rock Incense, Star Piece +2 more
Floroma Meadow
Wild: Bellossom 20% · Lv 60, Roselia 20% · Lv 60, Cherrim 10% · Lv 60, Jumpluff 10% · Lv 60 +10 more
Mt. Coronet North
Wild: Goldeen 100%, Zubat 90%, Clamperl 40%, Huntail 40% +21 more
Canalave City
Wild: Lumineon 60%, Pelipper 60%, Clamperl 40%, Qwilfish 40% +14 more
Trainers: ★ Barry #5 (Player picked Chimchar, on Canalave Bridge) Lv 57, ★ Barry #5 (Player picked Piplup, on Canalave Bridge) Lv 57, ★ Barry #5 (Player picked Turtwig, on Canalave Bridge) Lv 57
Pick up: TM48 Skill Swap, TM74 Gyro Ball, Armor Fossil, Skull Fossil
Canalave Library
Iron Island
Wild: Hariyama 20% · Lv 56, Mawile 20% · Lv 56, Armaldo 10% · Lv 56, Corsola 10% · Lv 56 +10 more
Trainers: Pokémon Trainer Riley (Tag Partner) Lv 62, Galactic Calypso (Multi Battle With Galactic Thalassa) Lv 55, Galactic Thalassa (Multi Battle With Galactic Calypso) Lv 55, Galactic Despina (Multi Battle With Galactic Galatea) Lv 56, Galactic Galatea (Multi Battle With Galactic Despina) Lv 54, Galactic Hippocamp (Multi Battle With Galactic Psamanthe) Lv 55 +11 more
Pick up: TM23 Iron Tail, HM04 Strength, Big Nugget (hidden), Dome Fossil, Dusk Ball, Elixir, Exp. Share, Heart Scale +11 more
Iron Island
Wild: Hariyama 20% · Lv 56, Mawile 20% · Lv 56, Armaldo 10% · Lv 56, Corsola 10% · Lv 56 +10 more
Trainers: Pokémon Trainer Riley (Tag Partner) Lv 62, Galactic Calypso (Multi Battle With Galactic Thalassa) Lv 55, Galactic Thalassa (Multi Battle With Galactic Calypso) Lv 55, Galactic Despina (Multi Battle With Galactic Galatea) Lv 56, Galactic Galatea (Multi Battle With Galactic Despina) Lv 54, Galactic Hippocamp (Multi Battle With Galactic Psamanthe) Lv 55 +11 more
Pick up: TM23 Iron Tail, HM04 Strength, Big Nugget (hidden), Dome Fossil, Dusk Ball, Elixir, Exp. Share, Heart Scale +11 more
Underground Deep Sea Room
Wild: Relicanth 100%, Kabuto 60%, Omanyte 60%, Blastoise 40% +18 more
Underground Forest Room
Wild: Relicanth 100%, Omanyte 60%, Shellos 60%, Blastoise 40% +20 more
Underground Lava Room
Wild: Relicanth 100%, Kabuto 60%, Omanyte 60%, Blastoise 40% +19 more
Underground Icy Room
Wild: Relicanth 100%, Kabuto 60%, Omanyte 60%, Blastoise 40% +19 more
Old Chateau Foyer
Wild: Gastly 54% · Lv 6-66, Haunter 20% · Lv 39-66, Misdreavus 20% · Lv 16-56, Drifloon 4% · Lv 17 +1 more
Old Chateau Dining Room
Wild: Sableye 25% · Lv 46-66, Haunter 20% · Lv 39-66, Misdreavus 20% · Lv 16-56, Snorunt 20% · Lv 16 +4 more
Old Chateau Side Rooms
Wild: Gastly 49% · Lv 26-46, Haunter 20% · Lv 66, Shuppet 20% · Lv 26-36, Banette 5% · Lv 56 +2 more
Old Chateau Hallway
Wild: Gastly 34% · Lv 6-66, Haunter 20% · Lv 46, Misdreavus 20% · Lv 16-56, Drifloon 4% · Lv 17 +2 more
Old Chateau Storeroom
Wild: Gastly 80% · Lv 14-17
Old Chateau Bedrooms
Wild: Gastly 30% · Lv 16-66, Drowzee 20% · Lv 46, Haunter 20% · Lv 39-66, Misdreavus 20% · Lv 16-56 +2 more
Old Chateau Empty Room
Wild: Misdreavus 45% · Lv 16-66, Gastly 29% · Lv 6-26, Haunter 20% · Lv 39-66, Snorunt 10% · Lv 66 +2 more
Lost Tower 1F
Wild: Whismur 40% · Lv 24, Gloom 10% · Lv 24, Kecleon 10% · Lv 24, Stunky 10% · Lv 24 +8 more
Lost Tower 2F
Wild: Chimecho 20% · Lv 46, Raticate 20% · Lv 46, Ariados 10% · Lv 46, Gastly 10% · Lv 46 +8 more
Acuity Lakefront
Wild: Absol 20% · Lv 65, Ursaring 20% · Lv 65, Abra 10% · Lv 65, Kadabra 10% · Lv 65 +7 more
Pick up: Ultra Ball
Snowpoint City
Wild: Slowpoke 60%, Dewgong 40%, Piplup 40%, Shellder 40% +11 more
Pick up: TM72 Avalanche, Lum Berry, Rare Candy (hidden), Ultra Ball
Snowpoint Temple
Wild: Bronzor 20% · Lv 75, Froslass 20% · Lv 75, Glalie 20% · Lv 75, Mawile 20% · Lv 75 +8 more
Also open from here
10 more areas the same checkpoint opens, each with its own page.
★ Commander Jupiter (Fog, Double Battle) — Route 210 North
| Pokémon | Moves | |
|---|---|---|
 | Tauros Lv 53 · Intimidate · White Herb Nature Impish | Giga Impact Rage Earthquake Bulk Up |
 | Gyarados Lv 53 · Intimidate · Wacan Berry Nature Impish | Aerial Ace Aqua Tail Dragon Dance Rage |
 | Magnezone Lv 54 · Levitate · Zoom Lens Nature Modest | Zap Cannon Lock-On Flash Cannon HP Ground |
 | Medicham Lv 53 · Pure Power · Life Orb Nature Naive | Acupressure Vital Throw Psycho Cut Ice Punch |
 | Regirock Lv 52 · Solid Rock · Lum Berry Nature Quirky | Rock Slide Rock Polish Stomp Ice Punch |
 | Tangrowth Lv 54 · Magic Guard · Zoom Lens Nature Naive | Ancient Power Frenzy Plant Growth Earth Power |
★ Cyrus (Fog) — Celestic Town
| Pokémon | Moves | |
|---|---|---|
 | Deoxys (Speed) Lv 54 · Magic Guard · Lum Berry Nature Bashful | Spikes Psycho Boost Stealth Rock Extreme Speed |
 | Metagross Lv 53 · Clear Body · Life Orb Nature Quirky | Explosion Double Team Meteor Mash Earthquake |
 | Rotom Lv 54 · Levitate · Sitrus Berry Nature Quiet | Shock Wave Ominous Wind Nasty Plot Aurora Beam |
 | Suicune Lv 52 · Pressure · BrightPowder Nature Sassy | Rest Calm Mind Water Pulse Solar Beam |
 | Salamence Lv 53 · Intimidate · Haban Berry Nature Mild | Dragon Dance Aerial Ace Outrage Rage |
 | Weavile Lv 55 · Technician · Focus Band Nature Modest | Feint Attack Aerial Ace Ice Shard Low Kick |
★ Barry #5 (Player picked Chimchar, on Canalave Bridge) — Canalave City
| Pokémon | Moves | |
|---|---|---|
 | Staraptor Lv 56 · Reckless · Lum Berry Nature Careful | Brave Bird Double-Edge Close Combat U-turn |
 | Ambipom Lv 55 · Technician · Silk Scarf Nature Impish | Fake Out Pursuit Rage Double Hit |
 | Electivire Lv 54 · Adaptability · Expert Belt Nature Docile | Earthquake Pursuit Wild Charge Ice Punch |
 | Slaking Lv 54 · Truant · White Herb Nature Relaxed | Giga Impact Rage Pursuit Sleep Talk |
 | Swampert Lv 56 · Swift Swim · Rindo Berry Nature Adamant | Earthquake Avalanche Aqua Tail Poison Jab |
 | Empoleon Lv 57 · Swift Swim · Life Orb Nature Naughty | Drill Peck Swords Dance Aqua Jet Earthquake |
Also fought around here
This game's documentation doesn't say where 31 of its 481 fights happen, so those trainers are on no part of this walkthrough; they are all on the Trainers page. It also doesn't say when 14 of its areas open up, so they are listed together in the last part rather than guessed into the story.