I'm inclined to agree. The biggest problem with running Dual Dance, I find, is the fact that two coverage moves simply don't tackle the tier nearly as well as previous generations. For instance, edgequake - the pillar of gen 4 offense - now finds itself underwhelming against the diverse typing and bulky nature of the tier.
As for Dragon Dance, it really really really really sucks that Tyrantrum has the worst speed ever.
I would ask for a bit more SDef before Speed tbh. Not being able to set up on Pidgeot is pitiful, and even uninvested STAB Scalds do a number to it, and a lot of resisted special hits just do too much..
252 SpA Choice Specs Jolteon Thunderbolt vs. 4 HP / 0 SpD Tyrantrum: 150-177 (49 - 57.8%) -- guaranteed 2HKO after Stealth Rock
252+ SpA Magneton Thunderbolt vs. 4 HP / 0 SpD Tyrantrum: 117-138 (38.2 - 45%) -- 8.2% chance to 2HKO after Stealth Rock
252 SpA Rotom-H Volt Switch vs. 4 HP / 0 SpD Tyrantrum: 75-89 (24.5 - 29%) -- guaranteed 4HKO after Stealth Rock
These calcs in particular are pretty embarrassing (don't even bring up Heliolisk, Grass Knot mauls Tyrantrum). So yeah gl making good use of that Electric resist ]:
252 SpA Adaptability Porygon-Z Tri Attack vs. 4 HP / 0 SpD Tyrantrum: 138-163 (45 - 53.2%) -- guaranteed 2HKO after Stealth Rock
some resistance that is. Z is bad but still jeez.
That being said Jolly Lum DD has its merits on the ladder, it really shines with Spikes support.
Problem with that is at that point there's not a whole lot of reason not to just use Salamence instead. So overall its usable but ultimately niche. Honestly, as much as I like set up Tyrantrum myself, for ladder play there's not a whole lot of reason to venture beyond Choice Band, it's by far the best set and makes the most of Tyrantrum's niche in UU over Salamence, spamming Head Meme.
Back on the topic of Serperior though,
Ok so I finally got reqs finished and want to say no ban. Now before you start the "omfg serp is broken af, what is this guy saying", let me give my reasoning first.
First I just wanted to find the number of UU viable pokemon that can at the minimum take a leaf storm and either outspeed and OHKO or tank another one and OHKO or use something like clear smog a la Amoongus.
Checks: Crobat, mega-Beedril, Goodra, Rotom-heat , mega-Pidgeot, Noivern, Ammongus, Roserade, AV Dragalge ,anything with reasonable special bulk and Av for that matter, Yanmega, anything scarfed and resists grass(like a kyurem or something), entei, fletchinder, moltres, (but these 3 are weak to Stealth Rock so meh), and many more that I probably forgot.
These are all pokemon that can take a leaf storm and I am disregarding the glare on the switch-in and the like.
Glare, Glare, if not for Serperior why use this over Hydreigon?, not as relevant as it used to be, Glare, Glare and a really meh option anyway, momentum sucker outside of stall, I'll give you this one, wait why am I not running specs?, Glare, and the rest is also Glare.
Disregarding glare when making this list is really convenient isnt it?
Turns out that's not really something you can do in practice.
And about Doublade....+2 252 SpA Life Orb Serperior Leaf Storm vs. 252 HP / 0 SpD Eviolite Doublade: 225-265 (69.8 - 82.2%) -- guaranteed 2HKO after Stealth Rock
I won't even address Zebstrika, it's obviously going to be the next suspect.