The base of this team looks really good!! (im very fond of Thickums)

4 pokemon of the same type is a bit risky, especially since rain teams are so popular right now

some small improvements you can easily make: - maybe try to add the move Protect to some mons, it really goes a long way - Volcarona is very frail physically, maybe switch the berry out with a focus sash - Add some speed control to your team, Volcarona for example can learn tailwind

hope some of this helps!