Because BL is technically a tier you could play (in a custom game) it wouldn't make sense because you wouldnt be able to use the mon that mega evolves in the first place, as it would be banned to OU. Also it really doesn't make a difference as there is no *official* playable BL tier.
Mega Pinsir + Dragonite is the most common "birdspam" core, but they should obviously be complimented by hazard removal due to their shared weakness of Stealth Rock.
Birdspam is a "playstyle" where you use two or more Flying-type to wear down mutual checks and counters, paving the way for another to sweep. Current Birdspam is mostly with M-Pinsir and Z-Fly Dragonite. I've seen variations of this with things like Z-Bounce Gyarados or Z-Fly Salamence.
"Bird Spam" became a thing in the last generation when people ran Talonflame and Staraptor together to smash through Rotom-W, hence, "bird" spam. The name developed over time to include other Fly-spam teams.
It's called double Defog or ilovepinkmons stall. It'd be hurt by the loss of Duggy but it's rather flexible so Ttar or Weavile could potentially replace it. It's in njnp's olt team thread.
Fighting-type mons and coverage were all much more prominent last gen. The advent of fairies and steels that aren't weak to fighting changed this. In addition, it's no longer too slow for the role, as it can easily set up twice. It also easily beats said new steels with Fire Punch/EQ.
Not much has really changed for it tbh. Some of its main draws as of now such as its bulk and typing were already there back in oras. What actually made mega ttar more appealing shortly after its release a couple of months ago is a combination of factors that made the meta more friendly to it. Mons that could easily check it last gen like specs keld and both scarf and defensive landot werent as common (granted scarf keld was still on a fair amount of teams), regular ttar wasnt as dominant as last gen because of dug which reduced the opportunity cost of running it, at the time there werent any megas that clearly stood up over the rest like mzor, lop and diancie from late oras and other megas like zard x and mega altaria (lol) early oras/xy which further lowered the opportunity cost. Theres probably other factors like one-time checks like rotomw and twave slowbro being dead rn but thats all I could think of. I dont think mega ttar is that good anymore (or at least not as good as it was when it was hyped) but it was a nice mega back when it was released this gen.
OU and all tiers under it
As per usual, the next VR update should be coming this friday
The tiers are defined by the usage of the Pokémon, and usage =/= viability; a lot of Pokémon from lower tiers are still very viable even if they aren't used as much. So even if Rotom-W is from a lower tier, it is still definitely viable and if it fits on your team, you will not be at a disadvantage when using it at all even if it is currently in UU.
Because viability has nothing to do with usage. If a mon is OU or UU is purely decided on if People use it in more than 3,41% of all games or not.
http://pokepast.es/a383877bc5b7a893
No rtm is for finished teams already, but the competitive tutoring room works!
If running MZor on Rain you'll Need to Change quite a lot of Things to make up for what you lose:
