The Thunderaffe (イダテンキリン Idaten Kirin?) is a Dream Eater that appears in Kingdom Hearts 3D: Dream Drop Distance. Its Spirit version is obtained via Spirit synthesis, while its Nightmare version can be found in Traverse Town and The World That Never Was.
Kingdom Hearts 3D: Dream Drop Distance
You know how fast lightning is? Well, these Dream Eaters don't... because they leave it in the dust every time. They move in straight lines, though, so just make sure you stay out of their way.