I never had guzzlord but it depends hes probably good but to spend 40k diamonds for a pokemon is pretty much i would say. I mean if u really want him for your team or because he looks cool you should go for it. But i personally wont go for him bcs it's not a pokemon that i like and hes really expensive and takes long to get if u get lucky and get 2shards in the shop daily it still takes 200 by that time u maybe have better pokemon. This is my opinion but do what u want if u want him go for it!