Which spirits can only be obtained by summoning?

Solution 1:

Source: All Summon-exclusive Spirits

Attack

  • Xander
  • Raiden
  • Samurai Goroh
  • Ephraim
  • Shadow Queen
  • Burrowing Snagret
  • Masked Dedede
  • Kyurem (Black Kyurem)
  • Daroach
  • Dillon
  • Rodin
  • Scizor
  • King Bob-Omb
  • The Wandering Samurai

Shield

  • Galacta Knight
  • Dyna Blade
  • Octopus
  • Proto Man
  • Absolutely Safe Capsule
  • Demise
  • Cat Peach
  • Baron K. Roolenstein
  • Ruto
  • Kyurem (White Kyurem)
  • Jimmy T.
  • Cordelia
  • Spyke

Grab

  • Master Cycle
  • Super Macho Man
  • Resetti
  • Pit (Original)
  • Queen Sectonia
  • Micaiah
  • Birdo
  • Knuckles
  • Louie
  • Barbara the Bat
  • Dixie Kong
  • Andross (Star Fox)
  • Wonder-Red
  • Ribbon Girl

Neutral

  • Master Core
  • Yellow Devil
  • Paper Mario
  • Plasm Wraith
  • Starfy
  • Fusion Suit
  • Shadow Mario
  • Koume & Kotake
  • Yung & Yang
  • D.J. Octavio
  • Mr. Shine & Mr. Bright
  • Tom Nook
  • DJ K.K.

Support

  • Gold Mario
  • Super Happy Tree
  • Great Fox
  • Jirachi
  • Judd
  • Squid Sisters
  • Epona
  • Moon
  • Mr. Saturn
  • Ultimate Chimera
  • Hector (Fire Emblem)
  • Chef (Game & Watch)
  • Phosphora
  • Mona
  • Pete
  • Tortimer
  • Blathers
  • Rush
  • Tree (Wii Fit)
  • Mother Fairy
  • Dhalsim
  • Inkling Squid
  • Julius Belmont
  • Thwomp
  • Nabbit
  • Sprixie Fairies
  • Cappy
  • Professor Elvin Gadd
  • Togepi
  • Jet the Hawk
  • Sonic the Werehog
  • Phyllis & Pelly
  • Warrior (Wii Fit)
  • Formula
  • E. Honda
  • Ibuki
  • Flow
  • Jill & The Drill Dozer
  • Ninjara

Note that once you summon these spirits, they have a chance to appear on the Spirit Board.