Location-based Evolution

Location-based Evolution refers to Pokémon that evolve when leveling up in a certain area in the Pokémon games. This method of Evolution was introduced in Generation IV.

List of location-based Evolutions

Previous Evolution		Location-based Evolution			Later Evolution
Introduced in Generation IV
Magnemite Electric Steel	Level 30+ →	Magneton Electric Steel	+ Level up in a special magnetic field →	Magnezone Electric Steel	Magnezone does not evolve
Eevee is the lowest in its line		Eevee Normal	+ Level up near a Moss Rock →	Leafeon Grass	Leafeon does not evolve
Eevee is the lowest in its line		Eevee Normal	+ Level up near an Ice Rock →	Glaceon Ice	Glaceon does not evolve
Nosepass is the lowest in its line		Nosepass Rock	+ Level up in a special magnetic field →	Probopass Rock Steel	Probopass does not evolve
Introduced in Generation VII
Grubbin Bug	Level 20+ →	Charjabug Bug Electric	+ Level up in a special magnetic field →	Vikavolt Bug Electric	Vikavolt does not evolve
Crabrawler is the lowest in its line		Crabrawler Fighting	+ Level up at Mount Lanakila →	Crabominable Fighting Ice	Crabominable does not evolve
Introduced in Generation VIII
Yamask is the lowest in its line		Galarian Yamask Ground Ghost	+ Go through the stone arch found at the Dusty Bowl after taking at least 49 HP in damage from attacks without fainting →	Runerigus Ground Ghost	Runerigus does not evolve

List of other methods of Evolution

These are other methods of Evolution that can be used to evolve into the same species as the location-based Evolutions.

Previous Evolution		Evolution			Later Evolution
Introduced in Generation VIII
Magnemite Electric Steel	Level 30+ →	Magneton Electric Steel	Thunder Stone →	Magnezone Electric Steel	Magnezone does not evolve
Eevee is the lowest in its line		Eevee Normal	Leaf Stone →	Leafeon Grass	Leafeon does not evolve
Eevee is the lowest in its line		Eevee Normal	Ice Stone →	Glaceon Ice	Glaceon does not evolve
Nosepass is the lowest in its line		Nosepass Rock	Thunder Stone →	Probopass Rock Steel	Probopass does not evolve
Grubbin Bug	Level 20+ →	Charjabug Bug Electric	Thunder Stone →	Vikavolt Bug Electric	Vikavolt does not evolve
Introduced in Generation IX
Crabrawler is the lowest in its line		Crabrawler Fighting	Ice Stone →	Crabominable Fighting Ice	Crabominable does not evolve

In the core series games

A location-based Evolution is triggered once the Pokémon levels up at the end of a Pokémon battle or by the use of a Rare Candy. From Generation VIII onwards, some Evolution stones can be used instead of some location-based Evolutions.

Eevee's Evolution by leveling up near a Moss Rock or Ice Rock (into Leafeon or Glaceon, respectively) takes precedence over all its other Evolutions triggered by level-up. For more details, see Eevee → Evolution data.

In the spin-off games

Pokémon Mystery Dungeon series

In the Pokémon Mystery Dungeon series, some alternative methods of Evolution replace the location-based Evolutions.

Pokémon Mystery Dungeon: Explorers of Time, Explorers of Darkness, Explorers of Sky, and Gates to Infinity

In Pokémon Mystery Dungeon: Explorers of Time and Explorers of Darkness, Explorers of Sky, and Gates to Infinity, certain Evolution items are used:

The Coronet Rock causes Magneton to evolve into Magnezone, and Nosepass to evolve into Probopass.
The Frozen Rock causes Eevee to evolve into Glaceon.
The Mossy Rock causes Eevee to evolve into Leafeon.

Pokémon Super Mystery Dungeon

In Pokémon Super Mystery Dungeon, there is no requirement to evolve these Pokémon.

In animation

Pokémon the Series: Diamond and Pearl

In Nosing 'Round The Mountain!, Alan's Nosepass evolved into Probopass in a battle against Ash near Mount Coronet.

In A Full Course Tag Battle!, an Ice Rock appeared in a flashback, where it was revealed that May had visited it in a cave near Snowpoint City in order to evolve her Eevee. Unlike the games, where an Eevee must be leveled up but can be anywhere in the area housing the Ice Rock, May's Eevee promptly evolved into a Glaceon upon touching the Ice Rock, much like an Evolution stone.

In Cheers on Castaways Isle!, an island located in Diablo's Ocean contained a special magnetic field due to meteorites in the area. Several wild Nosepass and Probopass were seen inhabiting the island.

Pokémon the Series: Sun & Moon

In Getting a Jump on the Competition!, Hala evolved his Crabrawler into Crabominable in Mount Lanakila.

In That's Some Spicy Island Research!, Sophocles revealed that he wanted to evolve his Charjabug during his Pokémon School class's visit to Poni Island. Hearing this, the island's Nurse Joy suggested him to visit Vast Poni Canyon. In Evolving Research!, Sophocles visited the canyon, and his Charjabug successfully evolved into Vikavolt thanks to the canyon's special magnetic field.

In the manga

Pokémon Adventures

Diamond & Pearl arc

In Passing by Probopass and Maneuvering around Magnezone, Cyrus's Nosepass and Magneton evolved while inside Mount Coronet.

Trivia

In Pokémon HeartGold and SoulSilver, Magnezone, Probopass, Leafeon, and Glaceon are unavailable except by trading from Pokémon Diamond, Pearl, and Platinum. They cannot be obtained via Evolution since there is no special magnetic field, Moss Rock, or Ice Rock.
Electric is the only type shared by multiple location-based Evolutions (Magnezone and Vikavolt).
In the Pokémon Adventures manga, Eterna Forest's Moss Rock and later Mount Lanakila appeared over the course of the story but they were not seen triggering any location-based Evolutions.