#88 Grimer (Alolan)

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It was born from sludge transformed by exposure to X-rays from the moon. When its internal load of germs decreases, it dies.
– Pokemon Moon Pokédex

#691 Dragalge

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Tales are told of ships that wander into seas where Dragalge live, never to return.
– Pokémon Y Pokédex

Mega Gengar

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Shiny:

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Hiding in people’s shadows at night, it absorbs their heat. The chill it causes makes the victims shake.
– Pokemon Y Pokédex

#690 Skrelp

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Camouflaged as rotten kelp, they spray liquid poison on prey that approaches unawares and then finish it off.
– Pokemon X Pokedex

Mega Venusaur

Less than one month til X and Y!

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???
– Pokemon X/Y Pokedex

#544 Whirlipede

Last Bug and Poison type

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Whirlipede, the Curlipede Pokémon and the evolved form of Venipede. Whirlipede can spin its hard shelled body like a tire to smash into opponents.
– Ash’s Pokedex

#454 Toxicroak

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Toxicroak, the Toxic Mouth Pokémon and the evolved form of Croagunk. The poison produced in its sacks is carried through tubes in its arms to its knuckle claws.
– Ash’s Pokedex