USUM expands the Alola Pokedex over Sun and Moon. More Pokemon are available earlier, new Ultra Beasts join the roster, and Ultra Warp Ride opens up legendaries from every past generation. The late game is harder too. Ultra Necrozma will sweep your team if you're not ready. Same Trial system, bigger Pokedex.

B
Bisharp
#0625

Bisharp

darksteel
C
Bouffalant
#0626

Bouffalant

normal
D
Rufflet
#0627

Rufflet

normalflying
C
Braviary
#0628

Braviary

normalflying
D
Vullaby
#0629

Vullaby

darkflying
C
Mandibuzz
#0630

Mandibuzz

darkflying
C
Heatmor
#0631

Heatmor

fire
C
Durant
#0632

Durant

bugsteel
D
Deino
#0633

Deino

darkdragon
D
Zweilous
#0634

Zweilous

darkdragon
A
Hydreigon
#0635

Hydreigon

darkdragon
D
Larvesta
#0636

Larvesta

bugfire
A
Volcarona
#0637

Volcarona

bugfire
A
Cobalion
#0638

Cobalion

steelfighting
B
Terrakion
#0639

Terrakion

rockfighting
C
Virizion
#0640

Virizion

grassfighting
B
Tornadus
#0641

Tornadus

flying
B
Thundurus
#0642

Thundurus

electricflying
S
Reshiram
#0643

Reshiram

dragonfire
S
Zekrom
#0644

Zekrom

dragonelectric
B
Landorus
#0645

Landorus

groundflying
B
Kyurem
#0646

Kyurem

dragonice
B
Keldeo
#0647

Keldeo

waterfighting
B
Meloetta
#0648

Meloetta

normalpsychic
B
Genesect
#0649

Genesect

bugsteel
D
Chespin
#0650

Chespin

grass
D
Quilladin
#0651

Quilladin

grass
B
Chesnaught
#0652

Chesnaught

grassfighting
D
Fennekin
#0653

Fennekin

fire
C
Braixen
#0654

Braixen

fire
C
Delphox
#0655

Delphox

firepsychic
D
Froakie
#0656

Froakie

water
C
Frogadier
#0657

Frogadier

water
A
Greninja
#0658

Greninja

waterdark
D
Bunnelby
#0659

Bunnelby

normal
C
Diggersby
#0660

Diggersby

normalground
D
Fletchling
#0661

Fletchling

normalflying
D
Fletchinder
#0662

Fletchinder

fireflying
C
Talonflame
#0663

Talonflame

fireflying
D
Scatterbug
#0664

Scatterbug

bug
D
Spewpa
#0665

Spewpa

bug
C
Vivillon
#0666

Vivillon

bugflying
D
Litleo
#0667

Litleo

firenormal
C
Pyroar
#0668

Pyroar

firenormal
D
Flabébé
#0669

Flabébé

fairy
D
Floette
#0670

Floette

fairy
C
Florges
#0671

Florges

fairy
D
Skiddo
#0672

Skiddo

grass
  • 807 total, five more than Sun and Moon. The new additions are Ultra Beasts: Poipole, Naganadel, Stakataka, Blacephalon, and Zeraora. The Alola dex is slightly expanded with more encounter options early.

  • The story diverges around the midpoint. Necrozma absorbs the box legendary to become Ultra Necrozma, one of the hardest boss fights in any Pokemon game. Ultra Warp Ride lets you catch legendaries from every past generation. New Ultra Beasts, more early encounters, and the Mantine Surf minigame are added.

  • Ultra Necrozma has 167 Sp. Atk, 97 Speed, and gets a stat-boosting aura on top of that. It will sweep most teams. Common strategies: Zoroark's Illusion to bait a Fighting-type move, Toxic stalling, or a Focus Sash Pokemon with a super effective hit. It's level 60 and the biggest difficulty spike in the series.

  • A minigame where you fly through Ultra Space on Solgaleo or Lunala. Different colored wormholes lead to different Pokemon. Legendary Pokemon from past generations (Mewtwo, Ho-Oh, Groudon, etc.) appear in the furthest wormholes. It's the main way to catch non-Alolan legendaries without transferring from older games.

  • Still Gen 7, 3DS, 2017. USUM is the enhanced take on Alola. Same Trial system, but the story diverges around the midpoint into Ultra Space content. More Pokemon available earlier, new Ultra Beasts, and a harder endgame stretch.

  • Same three starters as Sun and Moon. Litten's Incineroar is still the most practical for the story since Intimidate neuters Totem Pokemon. But team building matters more in USUM because Ultra Necrozma demands a specific answer on your squad.

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Pokemon Comparison