You can feel the difference between Gen 6 and 7 format by looking at the title of the tier itself. An ORAS Ubers tournament would simply appear as "Ubers Single Elimination" while one in Sun and Moon would appear as "[Gen 7] Ubers Single Elimination."
Likely was during the very short time in which Deoxys-N being banned actually banned all Deoxys formes (a couple of weeks ago). It's been fixed for a while now.
Check out the Monotype entry on the Smogdex: http://www.smogon.com/dex/sm/formats/monotype/
If you're having trouble deciding on spreads and sets for Pokemon, you can always check out the Monotype Good Cores thread for ideas and examples that you could try out. Otherwise, Mega Venusaur with a minimum of 20 EVs for speed creeping uninvested Base 80s with the rest of the EVs and Nature boosting HP and Def is generally pretty good. Toxapex would probably be better Mixed with a few more EVs and Nature boosting Defense and max HP, that way you can still make great use of something like AV Alolan Muk for handling some more major special threats to Poison.
There is a viability ranking for each type in the OP; a general viability ranking would be rather useless.
It's under Monotype metagame discussion here: http://www.smogon.com/forums/threads/monotype-metagame-discussion.3587204/page-15#post-7158368
The huge power jump that Ash-Greninja brought to the table was too ridiculous for monotype to handle. With its capability of being a mixed attacker, having an amazing speed tier, and being able to use items over a mega stone, similar to Mega Ray, its simply too powerful to find a place in the metagame.
I'm a little out of practice so take my list with a grain of salt, but I'd say Fairy, Steel, Electric, Water, and either Psychic or Flying are the top 5 (not necessarily in that order).
This list is my opinion but generally more or less of what others I think would respond
I would move Fire to Mid Tier, given xard, drought torkoal, and how anti-meta the type is.
Mega Sableye completely shuts it down and can dish out a burn, but generally you can just chip damage Mandibuzz to put it in range of Mimikyu, Gengar, or Chandelure.
Marshadow isn't even officially revealed yet, so there's no reason to consider this for quite a while. Assuming the metagame doesn't change too much before it's finally available, it'll probably be allowed at first to see what kind of an impact it has. Once we see what it does, we'll make a decision.
Keep your Heatran healthy or run Choice Scarf Infernape.
![[Gemini]](/forums/data/avatars/m/53/53101.jpg?1536384142){kind=avatar}
