Notes:

Beetberry is a Grass/Poison Type.
It evolves into Beetbonk at level 30 and into BeetBoomBam when holding a Rotten Berry and traded for an Arraven holding a Pirate Hook.

Pokemon Darkness Entry:
"Beetberry is mentioned by many food critics to be the worst food they ever tasted, and for a good reason. Even the lightest lick of one can give horrible tastes and aftertastes."
Pokemon Light Entry:
"Beetberry is one of the foulest tasting things on the planet. Even its smell, a light whiff of it, is horrible. Not even Snorlax or Swalot want to eat it."

Other notes:
Beetberry is exclusive to Pokemon Light.