Methods of Evolution

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There are numerous methods of evolution, which define how and when Pokémon evolve. Some are quite simple, others are not. These can make it slightly harder for some Pokémon to evolve in comparison to others.

Triggers

As of Generation IV, all Pokémon will evolve, having met certain requirements, after only one of three events:

• Leveling up
• Being exposed to an evolutionary stone - 24 Pokémon
• Being traded - 16 Pokémon

Of course, it is not sufficient that one of these events happens, but it is also neccesary that all the required conditions are met. Therefore, when we are speaking about a method of evolution, we mean both the event and the conditions. Which one of the evolution-triggering events must happen to make certain Pokémon reach its next evolution stage and what conditions must be met is determined for each Pokémon individually.

Pokémon from branched evolution families may evolve into different forms depending on the event that caused evolution and other conditions.

Evolving by level

This is the most common trigger of evolution: most Pokémon evolve when they level up. It is not neccessary that Pokémon levels up by gaining experience in a battle: Rare Candy will also trigger evolution if all conditions are met. However, leveling up in Daycare will not cause evolution. Also, it will not evolve if it is holding an Everstone. If a Pokémon levels up in a battle, the evolution will be triggered immediately after the battle. Of course, there are no Pokémon that evolve by leveling up without any additional conditions.

Reaching a certain level

Amongst Pokémon that evolve by level, most Pokémon evolve as soon as they reach a certain level by leveling up. If a Pokémon is not able to evolve when it reaches the required level, it will try to evolve every time it levels up again.

Example: Ekans evolves into Arbok at level 22.

This method of evolution in most cases has no special disadvantages. However, Meowth, for example, evolves into Persian at level 28, but learns Pay Day at level 32. In Generation IV, Persian cannot learn Pay Day by leveling up, what means that if a player wants to have a Persian with Pay Day, that player must not let Meowth evolve until it has learned this attack.

Furthermore, Pokémon cannot evolve if they are still in their base form until level 100, because they cannot level up any further.

Happiness

Some Pokémon evolve by leveling up if their hidden Happiness stat is 220 or above. It is usually true for baby Pokémon such as Cleffa, but also holds true for some other Pokémon, including Chansey (evolves to Blissey). This method of evolution was introduced in Generation II.

The following Pokémon evolve using this method:

• Golbat → Crobat
• Chansey → Blissey
• Pichu → Pikachu
• Cleffa → Clefairy
• Igglybuff → Jigglypuff
• Togepi → Togetic
• Munchlax → Snorlax
• Buneary → Lopunny

Less common conditions

Knowing a certain move

Some Pokémon evolve when they level up if they know a certain move. All of them can learn required moves by leveling up. However, if they are made to forget these moves, they must relearn them in order to evolve with the help of move relearner. This method of evolution has been introduced in Generation IV.

• Rollout
  • Lickitung → Lickilicky
• AncientPower
  • Tangela → Tangrowth
  • Yanma → Yanmega
  • Piloswine → Mamoswine
• Double Hit
  • Aipom → Ambipom
• Mimic
  • Mime Jr. → Mr. Mime
  • Bonsly → Sudowoodo

Being in a certain area

This method of evolution has also been introduced in Generation IV games, where some Pokémon evolve when they level up in a certain area.

• At Mt. Coronet
  • Magneton → Magnezone
  • Nosepass → Probopass
• In Eterna Forest
  • Eevee → Leafeon
• On Route 217
  • Eevee → Glaceon

Holding a certain item

Some Pokémon evolve when they level up if they are holding a certain item. In this case the item disappears after the Pokémon evolves.

• Happiny (holding Oval Stone) → Chansey
• Gligar (holding Razor Fang) → Gliscor
• Sneasel (holding Razor Claw) → Weavile

To see evolutions such as how Onix evolves into Steelix check below.

By time and happiness

Some Pokémon evolve by leveling up being happy, but only during a certain part of the day.

The following Pokémon are known to evolve this way:

• Day
  • Eevee → Espeon
  • Budew → Roselia
  • Riolu → Lucario
• Night
  • Eevee → Umbreon
  • Chingling → Chimecho

With a certain Pokémon in the party

This is a unique condition: Mantyke evolves into Mantine when it levels up only if there is a Remoraid in user's party.

With high enough Beauty

This is also a unique condition: Feebas evolves into Milotic by leveling up if its Beauty stat is 170 or above.

With a certain gender and at a certain level

It is the third unique condition: Combee evolves into a Vespiquen if it is female. Male Combee do not evolve.

With an empty slot

This is the fourth unique condition: When Nincada evolves into Ninjask (at level 20), if there is an empty slot in the party, a Shedinja will appear. In Generation IV, the player must also have a spare Poké Ball in their bag.

Additional factors

Some Pokémon from branched evolution families evolve into different forms depending on some additional factors. These factors are not conditions for evolution, since they do not determine the possibility of evolution, but what the Pokémon will become after evolution.

• Burmy. This Pokémon evolves at level 20, but its new form is determined by its gender and cloak (and cloak changes according to the place, where it has battled last time).
  • Male Burmy → Mothim
  • Female Burmy → Wormadam, but the type combination of Wormadam is determined by the cloak.
    • With Plant cloak (after battling in the wild) → Bug/Grass Wormadam
    • With Sandy cloak (after battling in a cave or on a beach) → Bug/Ground Wormadam.
    • With Trash cloak (after battling in a building) → Bug/Steel Wormadam.

• Tyrogue. This Pokémon evolves at level 20 depending on its stats.
  • If its Defense is higher than Attack, it evolves into Hitmonchan
  • If its Attack is higher than Defense, it evolves into Hitmonlee.
  • If Attack is equal to Defense, it evolves into Hitmontop.

• Wurmple. It evolves at level 7 into Silcoon or Cascoon, depending on its personality value. This value is hidden, determined when Pokémon is caught and cannot be affected by the player. See the article about personality value for the exact formula.

Espeon and Umbreon are not listed here, because they were already mentioned.

Evolution via evolutionary stone

Main article: Evolutionary stone

See also: Pokémon that evolve by evolutionary stone

Some Pokémon evolve when they are exposed to an evolutionary stone. The stone may be applied at any time, thus causing an instant evolution.

However, as the player can decide whether and when to evolve his or her Pokémon (although he always can decide it, since evolution can be cancelled or prevented by using an Everstone), he or she must take the decision carefully: most Pokémon will no longer be able to learn certain moves when they evolve in this way, and some (like Raichu) cannot learn any moves by leveling up, although there are exceptions to this rule and certain moves are exclusive to the stone-evolved Pokémon.

Examples

• Vulpix + Fire Stone → Ninetales
• Poliwhirl + Water Stone → Poliwrath
• Pikachu + Thunder Stone → Raichu
• Weepinbell + Leaf Stone → Victreebel
• Nidorino + Moon Stone → Nidoking
• Gloom + Sun Stone → Bellossom

Usually there are no special requirements for stone-induced evolution, with only two exceptions: Kirlia and Snorunt. They may evolve when they hit a certain level at either gender, or...

Kirlia	male or female	at level 30	→ Gardevoir
	male only	+ Dawn Stone	→ Gallade
Snorunt	male or female	at level 42	→ Glalie
	female only	+ Dawn Stone	→ Froslass

Note that sometimes the Oval Stone is said to be an evolutionary stone, because it is a stone and it is required for an evolution. However, technically Oval Stone is an evolution-inducing held item, which Happiny must be holding to evolve into Chansey when it levels up.

Evolution via trading

Main article: Trade

See also: Pokémon that evolve through trading

A select few Pokémon evolve only when they are traded. The evolution starts immediately after the trade is completed, regardless of the method of trading used. However, sometimes there are additional conditions.

Examples:

• Kadabra → Alakazam
• Machoke → Machamp
• Graveler → Golem
• Haunter → Gengar

A well-known mistranslation in the non-Japanese releases of the Generation I games suggested that after trading a man a Raichu, he said that it had evolved. This fueled speculation as to whether or not there would be a third stage to the Pikachu line in Generation II; a third stage was realized in the form of a Baby Pokémon, Pichu.

Holding a certain item

Main article: Evolution-inducing held item

See also: Pokémon that evolve by trading with a held item

Some Pokémon evolve when traded only if the are holding a certain item. Like any evolution-inducing held item, the item disappears after the Pokémon evolves.

Examples

The following Pokémon evolve using this method:

• Slowpoke → Slowking: trade while holding King's Rock
• Onix → Steelix: trade while holding Metal Coat
• Electabuzz → Electivire: trade while holding Electirizer
• Porygon → Porygon2: trade while holding Up-Grade
• Clamperl → Huntail: trade while holding DeepSeaTooth

References

• Evolution
• Evolutionary stone
• Evolution-inducing held item