This moveset is recommended only for Bronzongs on TrickRoom teams....

B-Zong makes a great lead for TR teams due to his numerous resistances and two immunities with the help of Levitate.

TrickRoom of course is for the main strategy, but if you see someone such as Azelf (who nowadays carries FlameThrower,or  Heatran, switch him out to someone who can take fire moves, such as T-Tar, Dragonite, etc

EXplosion is to put a large tent in HP as a last ditch effort ( except for Ghost whose immune to it or  Bronzong has done his job  after TR is up . This especially takes down Blissey!

Gyro Ball is a move that supports B-Zong's low base 33 speed and gets a STAB. 
It is also useful to use against Frosslass or Aerodactyl leads and deals resonable damage depending on B-Zong's atk.... You could replace this with one of the 'screens, hypnosis (not recommended due to its low acc) 

Stealth Rock is to break Focus Sashs ( takes care of Smeargle,) and do  good damage to Sala and Gyra
This could also be replaced with one of the screens, or anymove that would benefit your strategy...

To ensure he stays in there for some time, give him 252 HP evs, 126 in the defenses, and the extra 6 can go to atk or you can add 6 more points to the defense of your choice.

Give him a Relaxed nature or Sassy Nature depending on which defense stat you want more of...

Finally leftovers is to ensure he stays in there for some time and that he gets free recovery each turn........
