It can slip through any obstacle. It lurks inside walls to keep an eye on its foes.
どんな ものでも すりぬけられる。かべの なかに もぐりこんで あいての ようすを かんさつする。
Trivia
This is almost exactly the same as the Haunter that appeared in the Base Set; however, the wording is slightly different and Dream Eater does 10 more damage.