Okay, lots of stuff kinda weird on this team. First off: Hazards like Spikes and Stealth Rock are a but garbage in VGC, so idk what you would be doing with that Skarmory. Especially since Celesteela outclasses it in almost every way. Moxie on Gyarados is unusual, since most people run Intimidate, but if it works for you then you go you. The Tapu Koko is pretty standard, so it looks good. Although the Ground Silvally (btw: Multiattack is physical, so You would have wanted Naive instead of Modest) should probably switch over to Garchomp. I can't entirely say Incineroar is bad, it did win a premier challenge, but in this case Alolan Marowak would probably be more optimal to help protect Celesteela and Gyarados from electric attacks. As for the Extreme Evoboost Eevee... I doubt that would work out amazingly, but I can't entirely think of what I would suggest. Sometimes you need to be bold and read between the lines I reckon.
Hope that helps you with the team ya posted.