Part 9: Galactic split
Becomes available here: HM07 - Waterfall, HM08 - Rock Climb
Galactic split opens 17 areas. There are 116 trainers standing in them. The fights at this checkpoint are Cyrus (Trick Room), Commander Saturn, Barry (Tag Partner, if Player chose Chimchar), and 6 more.
Where to go
Route 220
Trainers: Swimmer Wang (Rain, Optional)* Lv 94, Swimmer Wang (Rain, Optional)* Lv 94, Swimmer Wang (Rain, Optional)* Lv 96, Swimmer Wang (Rain, Optional)* Lv 94
Route 221
Trainers: Sis and Bro Dora & Diego Lv 99, Fisherman Greg (Double Battle) Lv 96
Wayward Cave - OPTIONAL Gauntlet With Mira
Trainers: Mira (Tag Partner) Lv 97, Collector Gerald (Multi Battle with Clown Bob, Gauntlet)* Lv 85, Clown Bob (Multi Battle with Collector Gerald, Gauntlet) Lv 86, Camper Parker (Multi Battle with Picknicker Tori, Gauntlet) Lv 93, Picknicker Tori (Multi Battle with Camper Parker, Gauntlet) Lv 91, Bug Catcher Adalbert (Multi Battle with Camper Mike, Gauntlet) Lv 97 +7 more
Veilstone Warehouse
Trainers: Scientist Caliban Lv 87, Galactic Portia (Multi Battle with Galactic Cressida) Lv 88, Galactic Cressida (Multi Battle with Galactic Portia) Lv 84, Galactic Trinculo Lv 86, Galactic Umbriel (Multi Battle with Galactic Francisco) Lv 84, Galactic Francisco (Multi Battle with Galactic Umbriel) Lv 86 +45 more
Mount Coronet - Room 1
Trainers: Galactic Ganymede (Multi Battle with Galactic Halimede) Lv 100
LV 90 Steelix
Trainers: Galactic Halimede (Multi Battle with Galactic Ganymede) Lv 92, Galactic Squad Phobos (Double Battle) Lv 100, Galactic Squad Deimos (Optional Double Battle) Lv 89
CORONET HIGHLANDS OUTSIDE 1
Trainers: Galactic Despina (Multi Battle with Galactic Bianca) Lv 90, Galactic Bianca (Multi Battle with Galactic Despina) Lv 93, Galactic Ferdinand (Upstairs) Lv 92, Galactic Rosalind (In the grass to the Right) Lv 91, Galactic Squad Perdita (Optional Double Battle) Lv 88, Galactic Valetudo Lv 92 +1 more
LV 92 Vileplume
Trainers: Galactic Cressida (Multi Battle with Galactic Cupid, Rock Smash Route) Lv 91, Galactic Cordelia (Cut Split) Lv 92, Galactic Puck Lv 1, Trainer Cheryl (Tag Partner) Lv 100, Galactic Oberon (Multi Battle with Galactic Titania) Lv 87, Galactic Titania (Multi Battle with Galactic Oberon) Lv 88 +1 more
LV 100 Ditto
Trainers: Galactic Laomedeia (Optional) Lv 100, Galactic Larissa Lv 94, Trainer Riley (Tag Partner) Lv 100
LV 100 Absol
Trainers: Galactic Terra (Multi Battle with Galactic Luna) Lv 87, Galactic Luna (Multi Battle with Galactic Terra) Lv 88
CORONET HIGHLANDS OUTSIDE 2
Trainers: Galactic Europa Lv 92, Galactic Pluto Lv 91, Galactic Prospero Lv 94, Galactic Squad Amalthia (Double Battle, Rock Smash + Cut Path) Lv 88, Galactic Miranda (Strength + Rock Smash Path) Lv 92, Galactic Angrboda (Strength + Cut Path) Lv 95 +2 more
CORONET HIGHLANDS ROOM 2
Trainers: Galactic Callisto (Multi Battle with Galactic Hippocamp) Lv 90, Galactic Hippocamp (Multi Battle with Galactic Callisto) Lv 91
CORONET HIGHLANDS ROOM 3
Trainers: Trainer Marley (Tag Partner) Lv 100, Galactic Neptune (Multi Battle with Galactic Triton) Lv 90, Galactic Triton (Multi Battle with Galactic Neptune) Lv 85
Spear Pillar
Trainers: Tag Partner Mira* Lv 100
LV 100 Alakazam
Trainers: Galactic Mercury (Mutli Battle with Galactic Venus) Lv 87, Galactic Venus (Multi Battle with Galactic Mercury) Lv 91, ★ Barry (Tag Partner, if Player chose Chimchar) Lv 100
LV 100 Slaking
Trainers: ★ Barry (Tag Partner if Player chose Piplup) Lv 100, ★ Barry (Tag Partner, if Player chose Turtwig) Lv 100, ★ Commander Mars (Multi Battle with Commander Jupiter) Lv 89, ★ Commander Jupiter (Multi Battle with Commander Mars) Lv 95
DISTORTION WORLD
Trainers: ★ Cyrus (Double)* Lv 97, ★ Cyrus (Shadow Tag)* Lv 100
★ Cyrus (Trick Room) — Veilstone Warehouse
| Pokémon | Moves | |
|---|---|---|
 | Deoxys (Defense) Lv 90 · Magic Guard · Leftovers Nature Serious | Spikes Future Sight Recover Psycho Boost |
 | Rampardos Lv 93 · Mold Breaker · Berserk Gene Nature Gentle | Head Smash Pursuit Hammer Arm Zen Headbutt |
 | Heatran Lv 92 · Flash Fire · Sitrus Berry Nature Timid | Magma Storm Flash Cannon Dragon Pulse Explosion |
 | Registeel Lv 91 · Clear Body · Leftovers Nature Bashful | Gyro Ball Explosion Curse Earthquake |
 | Dusknoir Lv 94 · Levitate · Berserk Gene Nature Docile | Pursuit Shadow Punch Fire Punch Brick Break |
 | Regigigas Lv 88 · Clear Body · Iron Ball Nature Gentle | Curse Crush Grip Knock Off Earthquake |
★ Commander Saturn — Veilstone Warehouse
| Pokémon | Moves | |
|---|---|---|
 | Uxie Lv 87 · Levitate · Lum Berry Nature Mild | Stealth Rock Future Sight Hypnosis Energy Ball |
 | Zapdos Lv 89 · Drizzle · Macho Brace Nature Timid | Hurricane Thunder Water Ball Twister |
 | Metagross Lv 85 · Clear Body · Lum Berry Nature Bashful | Earthquake Meteor Mash Hammer Arm Rock Slide |
 | Rhydon Lv 92 · Lightning Rod · Focus Sash Nature Lonely | Earthquake Sand Tomb Aqua Tail Rock Slide |
 | Wailord Lv 82 · Pressure · Leftovers Nature Serious | Water Spout Curse Earthquake Avalanche |
 | Cresselia Lv 83 · Levitate · Leftovers Nature Impish | Calm Mind Lunar Dance Thunder Ice Beam |
★ Barry (Tag Partner, if Player chose Chimchar) — LV 100 Alakazam
| Pokémon | Moves | |
|---|---|---|
 | Swellow Lv 100 · Guts · Focus Sash Nature Naive | Facade Brave Bird Take Down Quick Attack |
 | Electivire Lv 100 · Adaptability · Soft Sand Nature Brave | Drain Punch Earthquake Ice Punch Wild Charge |
 | Ambipom Lv 100 · Technician · Silk Scarf Nature Hasty | Double Hit Fake Out Mud Bomb Fire Punch |
 | Empoleon Lv 100 · Swift Swim · Custap Berry Nature Adamant | Aqua Cutter Drill Peck Earthquake Swagger |
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.