Evolution () is the first evolutionin the Pokmon franchisewhen one Pokmon, upon reaching a certain level, using a certain stone, learning a certain move, orbeing traded, evolves into a different kind ofPokmon. In Pokmon Gold, Silver, Crystal, HeartGold and SoulSilver games, it is stated that Professor Elm is an expert on evolution, and discovered that Pikachu evolves from Pichu.

In the anime, during evolution, a Pokmon will become surrounded by a light and slowly change shape. In the original, Advanced, and Diamond & Pearl series, the Pokmon is surrounded by a white light, while in the Best Wishes!, XY, and Sun & Moon series, the Pokmon is surrounded by a golden or blue light.

To some Pokmon, evolution means growing up, while to others, it just refers becoming another species or getting upgraded. However, many of them retain the memories of their life during their pre-evolution form.

Pokmon gain experience after battling wild Pokmon and Pokmon Trainers. The more experience a Pokmon gains, the more it levels up. When a Pokmon reaches a particular level, it will evolve into its next form (if it has one). This is very helpful to most Trainers who want their Pokmon to become stronger.

There are ways to share experience, such as allow a Pokmon you wish it to evolve to hold Exp. Share. It is a hold item that allows the user to earn experience even if it did not participate in the battle. This is a convenient tool if you want to level up a new or low-level Pokmon.

Evolution can be prevented by simply press the 'B' button on the Game when the Pokmon is attempting to evolve. This is useful as some Pokmon will learn moves that cannot be learnt in a later form or if you want a Pokmon to learn a move earlier than usual. For example, Gabite. If you let Gible evolve into Gabite at level 24 it will learn Dragon Rush at level 49, but if you keep Gible it will learn Dragon Rush at level 37. Sometimes it doesn't matter if you let it evolve or not. The Pokmon can hold an Everstone, which keeps them from evolving, so that you don't have to keep cancelling the evolution every time the Pokmon levels up. However, if your Pokmon has evolved, it might not evolve again (Raticate, Linoone, etc.) Although some Pokmon can evolve more than once (Poliwhirl, Cascoon, etc.), some basic Pokmon just can't evolve, due to undiscovered forms, or if they are really rare (Chatot, Groudon, etc.) There are also Pokmon that can evolve into different things like love, choice, etc. For example, Eevee, Poliwhirl, Wurmple, or Kirlia.

Some Pokmon will not evolve unless you use a special stones called Evolutionary Stones. These special Items are linked to the Pokmon's type. Here are a list of Pokmon that can evolve by giving them the stones.

Some items are needed for a Pokmon to evolve. If a Pokmon hold the item allowing it to evolve, let it level up once and it will then evolve into the second form.

A small group of Pokmon refuses to evolve, no matter if you are at the appropriate level to trigger the evolve process, unless you trade them with a friend. Some Pokmon need to have a held item to evolve when trading with a friend. Another group require specific Pokmon to be trade in order to evolve.

Small groups of Pokmon requires a gender to evolve into the next stage.

Certain Pokmon, especially baby Pokmon, requires friendship with its trainer and if they are fond enough, they are willing to evolve. Some Pokmon only evolves in a certain time of the day with friendship.

Special Pokmon evolve at a certain area of location.

Certain Pokmon need to know a move to evolve. This method was introduced in Generation IV, starting with Diamond/Pearl/Platinum.

The current time of day will sometimes affect evolution. This method was introduced in Generation VI, starting with X/Y/OR/AS.

Some Pokmon have certain type of unique way of evolve.

Certain Pokmon will be able to evolve into a Mega form, the final form for one-evolution families and second/true final form for two-evolution families with the use of a Mega Stone, a held object. However this evolution will devolve back into their previous form at the end of the battle.

There's a special evolution that Ash's Greninja can do due to his strong bond with Ash called Ash-Greninja, that was later described as Bond Phenomenon.

Primal Reversion is a similar state to Mega Evolution, but the Pokmon devolve to a previous state in the past.

It is a possible game mechanic in Pokmon Omega Ruby & Alpha Sapphire, most likely because this mechanic was founded during development of Pokmon Omega Ruby & Alpha Sapphire.

Devolution is a form of reverse evolution when a Pokemon reverts to a previous state. Devolution does not exist in the games but is common in the Manga and TCG. Devolution is achieved mainly unnaturally - through experimentation, or Devolution Spray. Though certain Pokemon, such as Isamu's Clefairy and Pikachu are capable of devolving themselves. The TCG also has it that Eeveelutions can revert into Eevee and that Mew has twospecial attacks named the Devolution Beam and Devo Crush - both of which which devolves the Pokemon hit by the attack. Golurk and Jirachi also possess special attacks which allow them to devolve an opposing Pokemon.

In the Anime Episode, Electric Shock Showdown, Misty points out that once Pikachu evolves with the use of the Thunder Stone, Pikachu won't revert back.

In An Epic Defense Force, Luke's Golett seemingly evolves to Golurk in a Movie then Devolves back to Golett, repairing the Golurk Statue, as it turns out to be fictitious.

Another instance of the non-existence of Devolution, is when Bonnie requested Ash's Frogadier to devolve back to Froakie, Clemont said that it would be impossible.

- Charmander

- Charmeleon

- Charizard

- Mega Charizard X

- Mega Charizard Y

- Bulbasaur

- Ivysaur

- Venusaur

- Mega Venusaur

- Squirtle

- Wartortle

- Blastoise

- Mega Blastoise

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