Dark Evolution

Dark Evolution (暗黒進化 Ankoku Shinka, ダーク進化 Dāku Shinka) is a corrupt form of normal evolution. =Appearances=

Digimon Adventure
When Taichi aggressively forced Agumon to try to super evolve in "Dark Evolution! Skull Greymon" with disregard to Agumon and the others' feelings Agumon evolved into Skull Greymon. In this form Agumon lost all sense of himself and attacked anything and anyone nearby.

Digimon Adventure 02
In "The Evil Ring's Magic Runs Wild" the Digimon Kaiser seizes control of Agumon with an Evil Ring and attempts to forcefully evolve him into Metal Greymon. Instead, Agumon evolves into Skull Greymon and runs wild.

In "The Enemy is Metal Greymon" the Digimon Kaiser develops the Evil Spiral and uses it to seize control of Agumon again. This time the Dark Evolution is successful in evolving Agumon into a virus Metal Greymon which the Digimon Kaiser is able to command.

Digimon Tamers
In "The Kindhearted Hero, Leomon Dies!", Takato, enraged by the death of Leomon at the hands of Beelzebumon, forced Megalo Growlmon to evolve and become Megidramon, whose uncontrollable form almost destroyed the entire Digital World, from the power unleashed by the Digital Hazard symbol on its chest, concurrently having an effect on the Real World.

Digimon Savers
In "The Day of Parting - The Strongest Enemy: Thoma!", enraged by Thoma's apparent betrayal caused a dark aura to emit from Masaru's body, influencing the transformation of Shine Greymon to Shine Greymon Ruin Mode.

Digimon Adventure tri.
In Coexistence, Hikari becomes deeply depressed due to her brother's disappearance. As a form to fully release Meicoomon's destructive power, the Mysterious Man converts Hikari's bad feelings into viral data, forcing Nyaromon to dark evolve into Ofanimon: Falldown Mode, that later fuses with Raguelmon into Ordinemon.