It spits out POISONPOWDER to immobilize the enemy and then finishes it with a spray of ACID.
When hungry, it swallows anything that moves. Its hapless prey is melted inside by strong acids.
Even though it is filled with ACID, it does not melt because it also oozes a neutral izing fluid.
If its prey is bigger than its mouth, it slices up the victim with sharp leaves, then eats every morsel.
When it's hungry, it swings its razor-sharp leaves, slicing up any unlucky object nearby for food.
— Pokédex entries (via PokeAPI)