Rapid Spin (or variants). - Stealth Rock gets rid of multiscale (if I use dragonite), Focus Sash, Sturdy, and cripples flying and fire types. Also, sticky web feels way too broken if I don't rapin spin it.
A bulky defensive pokemon and a bulky specially defensive pokemon - these seem to be needed to switch into threats and avoid being swept.
One or two priority moves - could make or break a game.
Generally fast Pokemon - to force opponent to switch out
I feel that if I don't have the above things, I have more chance of losing. Agreed or have I not played enough variety of battles?
Other optional things that seem to help:
Roar/Whirlwind, Trick, Pokemon with immunities to a type (or resisting it x4), an electric or fire type to avoid paralysis or burn, Magic Guard.
If I built a team around these things, would it be pretty much good overall? The only major weakness I can see is Trick Room.