Beautifly is an ok deck, you can hit 120 pretty consistently (150 with burn + poison from Dustox), but the list suffers from not having a good finisher. Cradily should help, as you can get through a ton of your deck with Cocoon Collector to find Rare Candy, Fossil, and Cradily. This allows you to keep the Beautifly + Dustox stuff while having a way to do something once both Beautifly are knocked out.