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Paras (The Mushroom Pokémon)
Mushrooms grow on the back of this Pokémon, which absorbs nutrients from its bug host. These are commonly used in medicine and are called "Tochukaso".
I made a redesign for inflant, floatusk and swelephlant from pokemon Xenoverse
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Vileplume (The Plant Pokémon)
Its petals are one of the largests in the world. It contains a poisonous pollen that can paralyze a prey, allowing this Pokémon to devour them.
Treason / traición
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Gloom (The Weed Pokémon)
No, that's not drool oozing from its mouth. It's a nectar that is used to attract prey. It can also act as a fertilizer for plants and as an ingredient for perfume.
Also, it's important to note that it smells horrible.