Evolution/Evolution families/No evolution

The least common type of evolution family is that in which no evolutionary event takes place, meaning that it is made up of only one member. Many of the Pokémon that have no evolutionary relatives are and Mythical Pokémon. However, there are still 75 other Pokémon that do not evolve.

Not belonging to an evolutionary family is not indicative of strength, or a lack thereof. Some Pokémon, such as and, are comparable to fully evolved Pokémon while others, like  and , are more comparable to unevolved Pokémon. Often this indicates a Pokémon's possibility to be eligible for future new evolutions or pre-evolutions.