Pokémon aging
Pokémon have occasionally been shown at different ages or to have aged over time in various Pokémon media, most notably with appearances of particularly young and old Pokémon.
Aging is usually indepedent of Evolution, as some unevolved Pokémon have been shown to visibly grow older without evolving.
In the core series games
Pokédex entries
Some Pokédex entries mention how a Pokémon changes as it grows up:
- Paras has no mushrooms as an infant. They emerge as Paras matures and grow along with Paras.
- Squirtle's shell forms and hardens after it is born.
- Vulpix is born with one tail, which splits into more tails as it grows.
In the spin-off games
Pokémon Puzzle League
- In Pokémon Puzzle League, Tracey's elderly Scyther is one of the Pokémon in his team.
In animation
Pokémon the Series
Pokémon the Series: The Beginning
- Puka is an old Pikachu that appeared in The Pi-Kahuna. He also appeared younger in a flashback from 20 years before.
- Ash's Lapras debuted in The Lost Lapras, where it was caught as a young Lapras. In Viva Las Lapras, the Lapras herd is seen, including the mother of Ash's Lapras. In Lapras of Luxury, it was revealed that Ash's Lapras eventually matured into an adult and became the leader of the Lapras herd.
- Tracey's Scyther, which debuted in Tracey Gets Bugged, is shown to be elderly, losing the leadership of its herd to a younger Scyther.
- Mewtwo from Mewtwo Strikes Back appeared younger when it was still in the cloning tube and communicated telepathically with Ambertwo in The Uncut Story of Mewtwo's Origin. Mewtwo was fully grown when it first emerged from the tube.
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Puka in his youth -
Victor and Puka as of The Pi-Kahuna -
Ash's Lapras when young, its mother, and Ash's Pikachu -
Tracey and his Scyther -
Ambertwo and Mewtwo -
Mewtwo
Pokémon the Series: Gold and Silver
- Silver is a baby Lugia that debuted in The Mystery is History. Silver's parent is a Lugia that debuted earlier in Around the Whirlpool.
- A Noctowl having an old beard appeared in Throwing in the Noctowl belonging to Wings Alexander. In flashbacks, this Noctowl was seen as a Hoothoot and as a young Noctowl.
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Wings Alexander's Noctowl when it was younger -
Wings Alexander's Noctowl in the present day
Pikachu shorts
- An elderly bearded Bellsprout appeared in PK13.
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Elderly Bellsprout
Pokémon the Series: Ruby and Sapphire
- An elderly Treecko appeared in Tree's a Crowd.
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Old and young Treecko
Pokémon the Series: Diamond and Pearl
- Newly hatched Psyduck appeared in The Psyduck Stops Here!.
Pokémon the Series: Sun & Moon
- An elderly Stoutland debuted in That's Why the Litten is a Scamp!, taking care of a wild Litten. Uniquely for a visibly old Pokémon in Pokémon the Series, this Stoutland's age eventually caught up with it, causing it to pass away following the events of One Journey Ends, Another Begins....
- An artisitic depiction of a baby form of Celesteela appeared in Rise and Shine, Starship!.
- A baby Miltank appeared alongside multiple Miltank in The Young Flame Strikes Back!.
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Elderly Stoutland -
Baby Celesteela -
A baby Miltank in a Miltank herd.
Pokémon Journeys: The Series
- Jaye, an old man with an old Hoothoot, appeared in Finding a Legend!. Jaye has had his Hoothoot since his youth.
In the manga
Ash & Pikachu
- The baby Lugia, Silver, and its parent appeared in Let's Save The Lugia!.
Pokémon Battle Frontier
- In Enta Arrives at the Battle Frontier!, Enta was shown to own a young Vulpix that only had one tail. By the end of the chapter, Vulpix's tail split into six following some training.
