Klive Aw the guy who came second with Zygarde/Lycanroc and had other success doesn't play Bonnie and focuses on only using Lycanroc's GX attack. I believe there are interviews where he details his strategy, but from what I can gather you want to start with Zygarde/ or Baby buzz and put a lot of early pressure, use Lycanroc when your opponent establishes a threatening/difficult pokemon to knock out so you can build momentum to sweep with Zygarde late. Although, this may shift depending on the individual matchups as well.