Hi! Nice team here, and flattered to be mentioned in the OP! Butterfree <3
That Slowking + Hitmonchan + Entei core is really cool and strong on its own, and as other people said, there's not much to change about the team. Maybe Quagsire can be really troublesome if he manages to get Toxic on your Sceptile, so HP Grass or Toxic is an option on CB Entei I guess, but that's pretty rare anyways. Grats on your peak!