Pokémon evolutions by trading

This is a list of Pokémon that evolve by trading. The classic four evolutions (Alakazam, Machoke, Graveler and Gengar) from Red/Blue/Yellow evolve only by trading, while most Pokémon from later generations require an item to be held in addition.

This information applies to any games that feature both Pokémon from the chain, so for example in Generation 1 the evolution chain with Steelix doesn't exist.

The Pokémon

Evolving from
Evolving to
Item
PoliwhirlPoliwhirl PolitoedPolitoed King's Rock
KadabraKadabra AlakazamAlakazam
MachokeMachoke MachampMachamp
GravelerGraveler GolemGolem
Alolan GravelerGraveler
Alolan Graveler
Alolan GolemGolem
Alolan Golem
Trade, in Alola
SlowpokeSlowpoke SlowkingSlowking King's Rock
HaunterHaunter GengarGengar
OnixOnix SteelixSteelix Metal Coat
RhydonRhydon RhyperiorRhyperior Protector
SeadraSeadra KingdraKingdra Dragon Scale
ScytherScyther ScizorScizor Metal Coat
ElectabuzzElectabuzz ElectivireElectivire Electrizer
MagmarMagmar MagmortarMagmortar Magmarizer
PorygonPorygon Porygon2Porygon2 Up-Grade
Porygon2Porygon2 Porygon-ZPorygon-Z Dubious Disc
FeebasFeebas MiloticMilotic Prism Scale
DusclopsDusclops DusknoirDusknoir Reaper Cloth
ClamperlClamperl HuntailHuntail Deepseatooth
ClamperlClamperl GorebyssGorebyss Deepseascale
BoldoreBoldore GigalithGigalith
GurdurrGurdurr ConkeldurrConkeldurr
KarrablastKarrablast EscavalierEscavalier Trade with Shelmet
ShelmetShelmet AccelgorAccelgor Trade with Karrablast
SpritzeeSpritzee AromatisseAromatisse Trade holding Sachet
SwirlixSwirlix SlurpuffSlurpuff Trade holding Whipped Dream
PhantumpPhantump TrevenantTrevenant
Pumpkaboo (Average Size)Pumpkaboo
Average Size
Gourgeist (Average Size)Gourgeist
Average Size