#50 Diglett (Alolan)

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Its head sports an altered form of whiskers made of metal. When in communication with its comrades, its whiskers wobble to and fro.
– Pokemon Sun Pokédex

Mega Scizor

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Due to the effects of Mega Evolution, its pincers have taken on a more diabolical form, ripping anything they pinch to shreds.
– Pokemon Moon Pokédex

Mega Metagross

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This form results from one Metagross, one Metang, and two Beldum linking up.
– Pokemon Sun Pokédex

#707 Klefki

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These key collectors threaten any attackers by fiercely jingling their keys at them.
– Pokémon X Pokédex

#791 Solgaleo

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([edit] updated image, I forgot to anti-alias when exporting, oops)

Radiant Sun Version:

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It is said to live in another world. The intense light it radiates from the surface of its body can make the darkest of nights light up like midday.
– Pokemon Sun Pokédex

#679 Honedge

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If anyone dares to grab its hilt, it wraps a blue cloth around that person’s arm and drains that person’s life energy completely.
– Pokemon Y Pokédex

Mega Mawile

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It uses its docile-looking face to lull foes into complacency, then bites with its huge, relentless jaws.
– Pokemon X Pokedex