FusionDex

Bellwile uses its false mouth to hide among groups of Bellsprout in the wild. The fake mouth secretes an acidic sap that stuns the plant Pokémon, making it easy for Bellwile to prey on the unsuspecting group.

Its giant jaws are actually steel horns that transformed. A Bellwile's thin and flexible body lets it bend and sway to avoid any attack, however strong it may be.