Different pokémon available on Sehto have different lifespans. Ordered by length of average lifespan, descending:

===== Immortal =====

These pokémon simply will not die from old age. They can still be killed by regular means, though, providing you can pull it off:

  * [[species:Artither]] / Articuno
  * [[species:Electher]] / Zapdos
  * [[species:Pyrtha]] / Moltres
  * [[species:Mewtwo]]
  * [[species:Mew]]
  * [[species:Crinyx]]
  * [[species:Icechel]]
  * [[species:Fyrrcla]]
  * [[species:Psynateh]]
  * [[species:Solalon]]
  * [[species:Stasycl]]
  * Gastly / Haunter / Gengar
  * Porygon / Porygon2
  * Misdreavus
  * Unown
  * Wobbuffet

===== Mortal, approaching the lifespans of trees (500y+) =====

  * 600y: Onix / Steelix
  * 570y: Larvitar / Pupitar / Tyranitar
  * 520y: Geodude / Graveler / Golem

===== Mortal, exceeding the lifespans of whales (251y-500y+) =====

  * 480y: Magnemite / Magneton
  * 340y: Slowpoke / Slowbro / Slowking
  * 280y: Slugma / Magcargo

===== Mortal, sharing the lifespans of whales (131y-250y) =====

  * 250y: Abra / Kadabra / Alakazam
  * 240y: Magikarp / Gyarados
  * 240y: Snorlax
  * 230y: Paras / Parasect
  * 220y: Bulbasaur / Ivysaur / Venusaur
  * 170y: Lickitung
  * 160y: Natu / Xatu
  * 150y: Qwilfish
  * 140y: [[species:Saildont]] / [[species:Sailvage]] / [[species:Sailrage]]

===== Mortal, exceeding human lifespans (81y-130y) =====

  * 130y: Growlithe / Arcanine
  * 130y: Chansey / Blissey
  * 125y: Phanpy / Donphan
  * 110y: Charmander / Charmeleon / Charizard
  * 108y: Mareep / Flaaffy / Ampharos
  * 100y: Smoochum / Jynx
  * 97y: Swinub / Piloswine
  * 97y: Magby / Magmar
  * 95y: Squirtle / Wartortle / Blastoise
  * 93y: Lapras
  * 90y: Kangaskhan
  * 85y: Oddish / Gloom / Vileplume / Bellossom
  * 84y: Miltank / Tauros / [[species:Tauretal]]
  * 83y: Elekid / Electabuzz
  * 82y: Teddiursa / Ursaring
  * 81y: Skarmory

===== Mortal, approximately matching human lifespans (61y-80y) =====

  * 80y: Aerodactyl / [[species:Pteraglint]]
  * 80y: Mantine
  * 78y: Sentret / Furret
  * 78y: Machop / Machoke / Machamp
  * 77y: Smeargle
  * 75y: Pidgey / Pidgeotto / Pidgeot
  * 75y: Spearow / Fearow / [[species:Vijohrow]]
  * 72y: Sudowoodo
  * 70y: Koffing / Weezing
  * 69y: Zubat / Golbat / Crobat
  * 68y: Sandshrew / Sandslash
  * 67y: Tangela
  * 65y: Girafarig
  * 65y: Tyrogue / Hitmonlee / Hitmonchan / Hitmontop
  * 64y: Cleffa / Clefairy / Clefable
  * 64y: Igglybuff / Jigglypuff / Wigglytuff
  * 63y: Pichu / Pikachu / Raichu
  * 62y: Houndour / Houndoom
  * 62y: Vulpix / Ninetales
  * 62y: Nidoran / Nidorina / Nidorino / Nidoqueen / Nidoking
  * 62y: Scyther / Scizor
  * 61y: Poliwag / Poliwhirl / Poliwrath / Politoed
  * 61y: Ekans / Arbok

===== Mortal, long-lived (36y-60y) =====

  * 60y: Ponyta / Rapidash
  * 60y: Seel / Dewgong
  * 60y: Shellder / Cloyster
  * 58y: Rhyhorn / Rhydon
  * 38y: Totodile / Croconaw / Feraligatr
  * 55y: Pineco / Forretress
  * 52y: Togepi / Togetic
  * 51y: Delibird
  * 50y: Bellsprout / Weepinbell / Victreebel
  * 50y: Dratini / Dragonair / Dragonite
  * 48y: Kabuto / Kabutops
  * 48y: Drowzee / Hypno
  * 45y: Tentacool / Tentacruel
  * 42y: Snubbull / Granbull
  * 42y: Heracross
  * 41y: Chikorita / Bayleef / Meganium
  * 40y: Meowth / Persian
  * 40y: Corsola
  * 39y: [[species:Nukivar]]
  * 38y: Horsea / Seadra / Kingdra
  * 38y: Omanyte / Omastar
  * 37y: Cyndaquil / Quilava / Typhlosion
  * 36y: Psyduck / Golduck
  * 36y: Farfetch'd
  * 36y: Pinsir

===== Mortal, medium average lifespan (16y-35y) =====

  * 35y: Hoothoot / Noctowl
  * 35y: Stantler
  * 34y: Voltorb / Electrode
  * 34y: Marill / Azumarill
  * 33y: [[species:Sundisquama]]
  * 32y: Venonat / Venomoth / [[species:Venosect]]
  * 31y: Cubone / Marowak
  * 29y: Mr. Mime
  * 28y: Goldeen / Seaking
  * 24y: Rattata / Raticate
  * 24y: Sneasel
  * 23y: Wooper / Quagsire
  * 21y: Shuckle
  * 20y: Diglett / Dugtrio
  * 19y: [[species:Eucaron]]
  * 18y: Mankey / Primeape
  * 18y: Murkrow
  * 18y: Gligar
  * 17y: Remoraid / Octillery
  * 16y: [[species:Coronav]]

===== Mortal, short-lived (up to 15y) =====

  * 15y: Eevee / Vaporeon / Jolteon / Flareon / Espeon / Umbreon
  * 15y: Spinarak / Ariados
  * 14y: Doduo / Dodrio
  * 14y: Grimer / Muk
  * 13y: Krabby / Kingler
  * 13y: Staryu / Starmie
  * 12y: Exeggcute / Exeggutor
  * 12y: Aipom
  * 12y: Sunkern / Sunflora
  * 11y: Caterpie / Metapod / Butterfree
  * 10y: Dunsparce
  * 9y: [[species:Eryzard]]
  * 9y: Chinchou / Lanturn
  * 9y: Hoppip / Skiploom / Jumpluff
  * 8y: Weedle / Kakuna / Beedrill
  * 8y: Yanma
  * 8y: Ledyba / Ledian
  * 7y: Ditto