SonnyCaps014
Builds with mega charizard Y are naturally pretty formulaic (similar partners that follow a similar idea) but right now, something for keldeo is really important since you are really prone to it and water types in general. I dont see a reason to use hippo and tyranitar on the same team. To summarize what you could do with your team you could:
- Change gothitelle for a reliable keldeo switch-in, latios with thunderbolt seems like an option since it naturally checks keldeo and thunderbolt helps with azu. You could run roost + 3 attacks cause you have spin.
- You could run swords dance on excadrill if you decided to use defog on latios. Keldeo instead of hippowdon since it gives you a reliably answer against just like hippo, a resistant against rocks attacks and something to handle bisharp. Excadrill would be max attack and speed with either air balloon or life orb.
- Running SR on tyranitar with a moveset like: pursuit, stealth rock, ice beam, stone edge with 248 hp, 36 def, 224 spD relaxed nature is an option to have a SR user.
- For the last slot clefable could be an option for a tool against stally builds or a secondary potential win condition for slow teams.
Not a simple question so quite the long answer. Hope I helped!