It is not known to evolve into or from any other Pokémon.
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Stonjourner's body is made of boulders and stones. Occasionally, it will unleash a burst of speed to perform dynamic feats with its legs. Most of the time, it prefers standing in a field watching the sun's progress, preferring a quiet life. Curiously, once every year on a certain day, the Stonjourner from all over gather to form an evenly squared ring or circle. No one knows the reason why they assemble in this formation, leading to many theories, notably the position of sun, the earth's energy, and other factors.
Stonjourner may be based on Stonehenge, a mysterious monument from the Middle Neolithic of Wiltshire, England. It consists of a ring of standing stones. Stonjourner's behavior may reference the relationship between Stonehenge and astronomy and the fact that there is evidence that this monument used to be visited once a year and every year by a prehistoric culture, either in December or January.
Stonjourner may be a combination of stone and sojourner or journey.
Ishihenjin may be a combination of 石 ishi (stone), Stonehenge, and 変人 henjin (weird, eccentric) or 人 jin (man).