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I think it depends on what you want really. I mean I personally love Purugly, but one thing to consider is it's movepool. It it pretty lackluster in terms of Physical moves. If this is for in-game purposes, then you can always run a mixed variant, although it won't hit as hard. If you just want to have a bit of fun and use something you wouldn't normally use, I say go for it!
Since the Eviolite doesn't exist in this generation, and Purugly's stats are definitely better than Glameow's, I'd say you should just go ahead with the evolution. I know Purugly's design isn't as cute as Glameow, but you'll have better stats which always pays off.