Gonna put this out here; Zakki, everything I've seen from you so far is based PURELY on flavour, and while it isn't discouraged for the purposes of these revisions, I'd like to still see a bit more competitive reasoning behind all of this.
I have stated my arguments competitively against Weather Ball twice now, in that Cyclohm always has a better option in any instance, and that the "back-up" coverage given by running Hydro Pump AND Fire Blast together is a lot more useful in case no other persistent weather exists.
I would rather run Dragon Pulse / Fire Blast / Hydro Pump / Thunderbolt than Rain Dance / Thunder / Weather Ball / Dragon Pulse, due to reliability and quite bluntly, more efficiency.
Overheat I actually wanted since;
252 Timid Life Orb Cyclohm Fire Blast
vs. 252/0 Timid Leftovers Jirachi : 75.7% - 89.1%
vs. 252/0 Adamant Choice Band Metagross : 91.8% - 108.2%
vs. 252/92 Sassy Leftovers Bronzong : 66.9% - 78.7%
Meanwhile
252 Timid Life Orb Cyclohm Overheat
vs. 252/0 Timid Leftovers Jirachi : 88.1% - 104%
vs. 252/0 Adamant Choice Band Metagross : 107.1% - 126.4%
vs. 252/92 Sassy Leftovers Bronzong : 78.1% - 92.3%
there is enough of a difference that the numbers speak for themselves. And while I may not be in the best position to claim this, Overheat has better accuracy than Fire Blast, should you wish to switch in and check the likes of Metagross and Jirachi immediately. With Overheat, you guarantee the OHKO on full health Metagross.
and in regards to accuracy, the "why not use Flamethrower" problem;
252 Timid Life Orb Cyclohm Flamethrower
vs. 252/0 Adamant Choice Band Metagross : 73.1% - 86.3%
vs. 252/0 Timid Leftovers Jirachi : 60.4% - 71.3%
vs. 252/92 Sassy Leftovers Bronzong : 53.3% - 62.7%
Oh dear indeed.
As for Trick Room. I don't play Ubers at all, but I know from talking with Theorymon that Trick Room Palkia and Dialga are seriously viable. However, Cyclohm is nothing like them. It doesn't even come CLOSE to their power (seriously 118 SpA vs 150 SpA) nor does it come close to their bulk. I understand they're obviously Uber and Cyclohm is obviously made for OU, but then that only subtracts from the viability more. No offense to Jibaku and the others, but CAP Ubers is, imo a total gimmick which may be fun for LNTs, but does not earn any priority on my list.