PenguNF

I noticed while testing out the Trevenant crest that the forest field aspect of the crest doesn't seem to do anything? There's an animation that happens when Trevenant enters the field but that's it. No moves are boosted and when I read the crest description I made the assumption that the forest field would actually pop up. Am I not understanding what the crest is supposed to do lol or is it bugged?