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Maybe I'm late and this is common knowledge, but I just found out that USUM added dex entries for mega pokemon, and that the majority of them are really fucked up. They describe mega evolution as a horrible transformation that painfully contorts their minds and bodies and turns them into perfect killing machines, both physically and mentally.
Posting the notable examples I could find. Keep in mind, a significant number of megas aren't even in the gen 7 dex, and of the ones that are, a significant number of those are only in USUM, so around 60-75% of all mega pokemon dex entries are listed here.
mega alakazam (sun) Its hidden psychic power has been unleashed. A glance at someone gives it knowledge of the course of that person’s life, from birth to death.
mega gengar (sun) Gengar’s relationships are warped. It has no interest in opponents unless it perceives them as prey.
sorry no the gengar one was moon
mega kangeskan (sun) Thanks to Mega Evolution, its child grows. But as the child is good only at fighting and nothing else, its mother feels uneasy about its future. (ultrasun) The explosive energy the child is bathed in causes temporary growth. The mother is beside herself with worry about it. (ultra moon) When the mother sees the back of her Mega- Evolved child, it makes her think of the day when her child will inevitably leave her.
mega aereodactly (moon) When it Mega Evolves, it becomes more vicious than ever before. Some say that’s because its excess of power is causing it pain. (ultra sun) Mega Evolution places a burden on its body. The stress causes it to become all the more ferocious.