Foongus

Black +2: It lures people in with its Poké Ball pattern, then releases poison spores. Why it resembles a Poké Ball is unknown.

White: For some reason, this Pokémon resembles a Poké Ball. They release poison spores to repel those who try to catch them.

Black 2 / White 2: It lures Pokémon with its pattern that looks just like a Poké Ball then releases poison spores.

Y / Alpha Sapphire: It lures Pokémon with its pattern that looks just like a Poké Ball, then releases poison spores.

Sword: No one knows what the Poké Ball–like pattern on Foongus means or why Foongus has it.

Shield: The spores released from this Pokémon’s hands are highly poisonous, but when thoroughly dried, the spores can be used as stomach medicine.