Dynamax

Dynamax is a relatively new phenomenon that started to occur in Galar after the first Dynadens were discovered. So far no one seems to know how it exactly works.

Physiology
If an Elemental gets in touch with a Wishing Piece, a stone found inside the Dyna Dens, it fuses into their body.

Dynamaxing and it‘s side effects occur in phases. Unlike Mega-Evolution, those affected remember everything they do in this state.

This can cause a variety of different damages, raging from brain damage causing more violent behaviour to less obvious changes like a change in personality. In some rare cases its said that those Elementals act like they are being controlled by a parasite.

Trivia

 * The first Dynadens appeared about 150 years ago with unknown origin.
 * A scientist, who mysteriously died in a car accident, was the first one to look into a cure for the damage caused by the dynamax phenomenon. They mentioned that Mew and their ability to emulate the unique composition of each Elemental may be the right way.