Seel nest, too late?

I think you should get a decent dewgong from that seel nest because, just as they screwed over poor lapras in the last update, they could either restore dewgong's previous values or even buff him sometime in upcoming updates, so, who knows? Today's crappy pokemon can be tomorrow's tough one

I would never let a nest go to waste unless it was a confirmed useless mon. Dewgong doesn't qualify IMO. It can still get frost breath/blizzard and be quite useful. At least catch enough to evolve another one and maybe a high IV one for future use.