Gen V came up with mostly absolutely terrible ideas. One of them, is amoonguss. Honestly, this thing may just be the 5th worst pokemon to ever exist (in terms of design), next to Patrat, Watchog, Mandibuzz, Tympole, and Seismitoad. Were they trying to make another mushroom pokemon with yet another Grass/Poison typing? If so, it was a horrible idea to begin with and didn't come out too well. If you haven't seen amoonguss yet here's what it looks like.