Devon Energy (DVN) is an Aspirational stock that is one of the very few that has ever moved from Overvalued to Undervalued in a short period of time. In 2014, April Devon reached an overvalued position (130%FV) and proceeded to move back into fair value range which would be considered normal. But, then it proceeded to fall straight through fair value and move into undervalued territory by 2015, August. This was further complicated by the market energy concerns that surfaced in early 2016 dropping the share price to 2002 levels.
Once the stock starts to move sideways and/or with a bit of move to fair value the stock could be considered for a Buy.