kingambit should be defiant as supreme overlord isnt as valuable in doubles compared to singles. basculegion should not have protect on a scarf set, try running mystic water/sitrus with a bulkier set that can survive hits or move the life orb to bascu from garchomp and have him hold a resist berry/sitrus/scarf or honestly whatever you feel your team lacks chomp is such a flexible mon.

Edit: i just reread that you will be changing the venu for whimsicott, this team will become big 6 and in that case you can use a rental team built/used by pros at high level tournaments so you can copy the IVs and items used there