Evolution-inducing held item

An evolution-inducing held item is an item which makes the Pokémon holding it evolve when a certain event happens, such as if the Pokémon is traded or leveled up. The item disappears once the Pokémon has evolved. For evolution-inducing items that are not meant to be held, see the page on evolutionary stones.

In the Pokémon Mystery Dungeon series
The Mystery Dungeon series introduced some new evolutionary items as the series does not include elements such as day and night, and trading.

Underground
This is artwork of the items as seen in the Sinnoh Underground

Global Link
These are artwork of the items as seen in the Pokémon Global Link.

Pokémon GO
This is artwork of the items as seen in Pokémon GO.

In the anime
A King's Rock first appeared in Ring Masters, where received it as a prize for winning the Sumo Conference. 's later used it to evolve itself into a  in Outrageous Fortunes.

Another King's Rock appeared in A Crowning Achievement, where it was found on a rock after the water level in the local river dropped dramatically; Alice's used it to evolve into a.

A Deep Sea Scale and Deep Sea Tooth appeared in The Evolutionary War, where the people in the A-B-C Islands were having an argument over which Pokémon was best, or.

A King's Rock, two Deep Sea Teeth, and two Deep Sea Scales appeared in Showdown At Linoone as some of the items.

In One Big Happiny Family!, carved and made an Oval Stone for his newly born, which later helped her evolve into a  in The Brockster is In.

In Fighting Fear with Fear!, Ash received a Razor Fang from. Later in the episode, he used it to evolve his into a.

In the Pokémon Adventures manga
In Quilava Quandary, was given a King's Rock by the Day-Care Couple after training with them, which he gave to his  to hold. In Ampharos Amore, Gold's newly evolved and 's  evolved into a Politoed and a, respectively, while holding their respective evolutionary items, King's Rock and Dragon Scale.

In Yikes, Yanmega! II, 's, Kit, used a Protector to protect itself from Mars's swarm's soundwaves. Roseanne later revealed that the Protector was one of the items she used in her research of Pokémon Evolution, the other seen items being a Reaper Cloth, Dragon Scale, Magmarizer, and King's Rock.

In Dealing With A Koffing Fit, Silver's evolved into a  due to having gained experience while holding a Razor Claw, which had been given to Silver by.

In Raising the Stakes with Rhyperior, it was revealed that Silver had given a Protector to be held by his, allowing it to evolve into a  when it was traded between the two Trainers. Afterwards, Blue had let Silver keep Rhyperior as a replacement for his lost.

Trivia

 * In, the Prism Scale was incorrectly categorized in the Bag as a general item and not as an evolution-inducing held item. This was later fixed in , but starting from it is now again incorrectly categorized, this time as a valuable item.
 * Along with being listed amongst the evolutionary stones, the Oval Stone has the "Use" option when selected in the Bag, but if the undefined tries to use it, it won't say "Able" under any Pokémon.
 * This makes it the only evolutionary item with "Stone" in its English name which is not an evolutionary stone.