No idea if you're looking to swap out any Pokémon but having both Volcarona and Venomoth on one team seems a bit overkill on the Bug Buzz/Quiver Dancing side of things - perhaps the shiny Sylveon in your signature would be a good replacement for Venomoth if you're happy to use it? Up to you though, your team should fare pretty well as it is. Good job on finding all the shinies by the way!
I actually bred that Sylveon as a joke, but it actually does an amazing job taking hits (Bold nature). He has Quick Attack, Draining Kiss, Calm Mind, and Curse w/ the ability Pixilate right now. EVs are max Defense and Special Attack. If nothing else, it's fun to play with :)
I will probably use him on an Eevee team that can toss him some free buffs with Baton Pass.
Slowbro or Slowking would be immensely more helpful than Luvdisc, so I suggest replacing it with them.
Forgot to mention that she is my first shiny Pokemon ever :)
I already beat the Triple Battle challenge in the Battle Maison using a team revolving around opening with her, so the last ribbon she needs is to beat the Elite Four :)
That would be a good slot to put him on though! I like that she has HP/Fighting. I really only intended to use her for the water boss that has the Rock/Water guy on his team.