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[[File:Slowbro losing Shellder.png|thumb|200px|Slowbro losing Shellder]]
'''Devolution''' (Japanese: '''{{ruby|退|たい}}{{ruby|化|か}}''' ''degeneration'') is the process by which an [[Evolution|evolved]] {{OBP|Pokémon|species}} reverts to its previous form. This process is much less common than evolution due to being impossible within the [[core series]] {{pkmn|games}}. In most media in which it exists, devolution is often instigated through artificial means, such as sprays or genetic engineering.