Foongus is a white mushroom-like Pokémon with a cap that looks quite similar to a Poké Ball. It has stubby, digit-less arms, a large pink mouth, and pinprick-like dark eyes. It uses the Poké Ball-like pattern on its head to lure people and Pokémon in grassy areas, then releases a cloud of poisonous spores to defend itself. It moves by either hopping or turning on its side and rolling on its cap.
Multiple Foongus appeared in So You're Having a Bad Day!. Bonnie and Meowth landed on top of them, and whilst Meowth was able to escape unscathed, Bonnie fell victim to their Spores.
Foongus, the Mushroom Pokémon. Foongus release poisonous spores to repel anyone who tries to catch them. For unknown reasons, they resemble Poké Balls.
A Foongus appeared in The Case of the Missing Pokémon, where it was one of the Pokémon kidnapped by Team Plasma. It was later found in a stronghold and returned to its Trainer.
Foongus is a Pokémon owned by Whitley. She used him to defeat a Sigilyph, earning his Trainer a Pokédex. This Foongus is nicknamed "Foongy". Foongus was a Pokémon liberated by Team Plasma. He first appeared in A Difficult Parting.
Foongus, along with its evolution, is similar to Voltorb and Electrode in that it resembles a Poké Ball.
However, unlike Voltorb and Electrode, it only has a Poké Ball design on it, instead of being in the shape of one.
Likewise, it features the whole design, complete with the circle resembling the button in the middle (contrary to Voltorb's evolution line having just the shape and general colors, and according to the Pokédex, being transformed Poké Balls themselves).
All six Pokémon also share a common move, Spore, and ability, Effect Spore.
Foongus has the lowest base Speed stat of all Poison-type Pokémon.
Origin
It appears to be based on Amanita muscaria or mushrooms of the Agaricus genus, due to it being Poison-type. The cap is designed to look like the front of a Poké Ball.
Name origin
Foongus is a corruption of fungus and may be a combination of fool (to deceive, referencing its use of its Poké Ball-like cap to attract unsuspecting prey) and fungus. Together with its evolution, their names are a corruption of the phrase, "Fungus among us."
Tamagetake may be a combination of 玉 tama (sphere), 魂消る tamageru (to be astonished), and 茸 take (mushroom, or more specifically, the Shiitake mushroom).