In these happy times, Overqwil no longer exist, for they are best remembered for their role in one of the world's most gruesome forms of executions. Criminals and rebels were impaled on these cruciform pokemon in ten places and left to slowly expire, either from blood loss, poison, or the Overqwil behind them slowly feeding on their backs.
Cruel governments the world over wanted these pokemon, but a sufficient supply of Overqwil was rarely forthcoming. Only Hisui's Qwilfish had foul enough hearts, and there is only a single cave – called 'Valor Cavern' after the trait required to subdue one – where wild Overqwil ever appeared; they have not returned since the Galactic Bomb incident. The method to evolve a Qwilfish was a closely guarded secret, for the fishermen and merchants involved in this long-distance trade (executions by Overqwil appear in histories of lands as far away as Galar) feared the loss of their monopoly.
Although humans are an extremely creative species, and history abounds with ingenious examples of cruelty, ancient kings still fought over the Overqwil trade. They were careful to seize, not kill, those Overqwil owned by their enemies; an old saying held that, were the Overqwil ever lost, all nations would soon fall into anarchy. Some have taken this saying for the truth, noting that both happened, but it must be remembered that the time gap between the two events exceeded fifty years and that successful regicides were no less fond of these pokemon than kings who inherited their thrones; the tyrant impaled on their own Overqwil is an ancient trope which surely must have happened for real more than once.
Incidentally, the people who caught and raised the Overqwil belonged to a typical, relatively egalitarian Hisuian clan which does not seem to have ever practiced capital punishment.