well the idea of a Trick Room Rayquaza is slightly intriguing, since he is one of the slowest Ubers, and if you go absolute min Speed you're slower than pretty much everything but Forry, Bliss, and some Metagross.
Gyro Ball on the other hand is stupid. He may be slow enough to go first in Trick Room, but that doesn't make him slow enough to hit max power Gyro Ball on pretty much anything but Deoxys / Mewtwo / Darkrai. Pretty much everything else will get hit for ~120 BP if you're lucky, the same as STAB Dragon Claw, and Dragon is a much better attacking type
I could see a Trick Room Rayquaza working though, something like Bronzong using Trick Room then Explosion, then your super slow Rayquaza could come out, use Swords Dance on a switch (or use Focus Sash if you want), then go on a three turn rampage with Outrage. You can 2HKO Forrestress and Metagross with +2 Life Orbed Outrage, occaisonally OHKO max / max Lugia, and always OHKO pretty much everything else.
If you pack a Magnezone to get rid of Forry / Metagross (needs to be fast to Magnet Rise before Metagross EQs) / Bronzong, so you don't risk any of them exploding on you while you 2HKO them, then you can just Outrage away with no fear. Magnezone can also Explode after he kills the steel.. Assuming you connect with both explosions and you're opponent actually has a Steel, you could theoretically take out a gigantic chunk of the opponents team, maybe even the whole thing, and you could go with a Lum / Persim Berry for a second round of Outrage.
Of course, it's gimmicky as fuck, and gets ruined by tons of stuff, but it seems like something very fun to try out
