Are sylveon and florgres considered the best switch in vs hydreigon? w/o iron tail.
Yes. Things that can deal with Hydreigon with Steel-type coverage include Blissey, Empoleon, Milotic, Porygon2, Snorlax, Escavalier, Cobalion, AV Conkeldurr, and Mandibuzz. All of these check other Hydra sets as well, but struggle with Taunt or drop to other coverage moves like Fire Blast. They also take a lot more from Dracos or have no reliable recovery (save Blissey), forcing a healing move much more often or being worn down more easily.
Does this meta have anything bulky enough to take hit from banded head smash coming from tyranturm? (Note:Just a question)
Besides what CrystalFalchion mentioned, Cobalion, Krookodile, and Nidoqueen can check Tyrantrum pretty well, although the latter two can only switch into CB Head Smash once.
Curious and what some knowledge on why is Mega aero is better than mega bee?I know it has a better speed tier, maybe the best?Well, again it's a rock type.So it makes me wonder it aero's move coverage is what makes it so vialable?
As CF said they play different roles, but MAero has a lot more utility with being able to Pursuit-trap certain things, be a consistent win condition or wallbreaker with Hone Claws, and harass offensive teams with its speed and coverage.
Sticky web is a popular strategy?Galvantula, the only vialable web setter?
Sticky Webs are much more common on the ladder than tour play. Galv isn't dead weight outside of setting webs (LO Thunders or Bug Buzzes hurt), but Shuckle is the better setter atm:
[12:09] @GrilledClawitzer: Shuckle has been the good webs setter for a while now
[12:09] @GrilledClawitzer: Every webs team that had any kind of success lately featured Shuckle + Torn
As I am new, I thought asking what's exactly is Accelgor's role in a team?Maybe, taking out the dark types?
CF is right, although both Accelgor and Yanmega are mediocre options in the current metagame.