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Pikachu demands that you insert some Original Research at least so it's not a complete plagiarism: or he shall electrocute you into next week.
Sliggoo is a Dragon-type Pokémon from generation VI. It evolves from Goomy at starting at level 40 and evolves into Goodra starting at level 50 when leveled up during rain in the overworld. Rain instigated by Rain Dance, Drizzle, or Primordial Sea will not trigger this evolution.

In the 61st episode of the Pokémon XY series, Ash's Goomy evolved into Sliggoo. It later evolved into Goodra in the 65th episode. It can excrete sticky mucous that can dissolve anything, coating its entire body with it. Because its eyes have devolved from a Goomy's, it has trouble discerning friends and food, often attempting to calmly melt and eat those it gets along with without realizing it. Instead, it relies on its four horns to sense sounds and smells. The protrusion found on its back contains its brain and other organs. It crawls sluggishly.