It's more like glitched field effects. As seen http://www.gamefaqs.com/boards/genmessage.php?board=946308&topic=48789425 here, Gravity also activates the glitch under unknown conditions (maybe Pursuit again?), activating Gravity, Uproar and the usual four weather effects. This can possibly lead to Trick Room activating the glitch under those conditions, activating every possible field effect
EDIT: Trick Room activates the glitch. The order in which the weather effects appear is Rain, Sand, Sun, Hail, FOG. All of them deal the usual damage. Trick Room is still in effect, presumably Uproar and Gravity are too. If anyone is curious, the battle video number is 67-49391-63911
EDIT 2: The glitch started from Trick Room has every possible field effect, including Uproar and Gravity. Fog can be cleared with Defog and won't interfere with the glitch. Video is 71-58349-79250
EDIT: Trick Room activates the glitch. The order in which the weather effects appear is Rain, Sand, Sun, Hail, FOG. All of them deal the usual damage. Trick Room is still in effect, presumably Uproar and Gravity are too. If anyone is curious, the battle video number is 67-49391-63911
EDIT 2: The glitch started from Trick Room has every possible field effect, including Uproar and Gravity. Fog can be cleared with Defog and won't interfere with the glitch. Video is 71-58349-79250