Remember that guy in XY's Battle Maison that you used to pwn, the one who could invert the typechart? What if he ran a competitive meta?
RULES
The type-chart is inverted in all battle interactions, be it attacks, status moves, or even Stealth Rock.
Refer to the following for help:

Some Caveats:- Immunities become x2 SE. There are no immunities left in this tier based on typing alone
- The above does not affect ability-based immunities
- The above does not affect type-based immunities to statuses e.g. Electric Types unable to be Paralyzed, Steel Types unable to be Poisoned, Fire Type unable to be burned etc.
- Current OU banlist with the additional
- Banned: Kyurem-Black, Serperior, Hoopa-U, Kartana, Tapu Bulu, Tapu Lele, Diggersby
- Unbanned: Aegislash, Lucarionite, Dialga, Giratina, Solgaleo
- Standard clauses
- Sleep, OHKO, Species, Evasion, Moody, Swagger, Endless Battle, and Baton Pass
Ban reasoning:
Its main problem in OU (lack of Physical Ice STAB, ie no spammable STAB) is made irrelevant, as Dragon+Electric is perfect neutral coverage. Adamant Band 2HKOs the entire metagame (bar maxdef Salamence thanks to Intimidate) with rocks up, including Avalugg. It also has Ice Beam for a more reliable hit on Avalugg. Sets such as Scarf clean vs offense with ease, SubRoost smashes stall, etc. Its typing isn't even that bad.
Partly held back in OU by its awful offensive coverage, here Grass is one of the best offensive types and offers near perfect coverage when paired with Dragon Pulse or even HP Fire/Poison. Worry Seed beats Sap Sipper, and you have Taunt, SubSeed, Aromatherapy, Giga Drain and Glare as other options.
No new switchins have been introduced since last gen. You can find some more thoughts by sinpi here.
One of the strongest offensive types in Grass, Beast Boost and access to SD (even though Band can already 2hko Avalygg), it's pretty clear that SR isn't enough to hold back this unwallable mon
Absolutely horrendous typing makes it incredibly exploitable. 3 4x weaknesses.
Has arguably the worst typing in the metagame, making setting up quite tricky. Very very strong if it does get a SD boost, though, so it will be watched.
Quad weak to rocks, awful typing. Has a lot of power but is far too easy to pressure.
Awful typing (notice a theme?). Pretty cool offensively but is not broken by any means.
Its typing gives it 8 weaknesses to common types which significantly cuts into its "bulk". Perfectly viable, but not broken.
10 weaknesses including a 4x weakness to psychic, and rocks weak. I'm rather iffy on this but I can't see it being super problematic.
FAQ
Where can I play this?
rom.psim.us thanks to urkerab!
[nothing more so far]
What's new with USUM?
New threats in the UBs, new weather mons, and Tapus, and also lost some major faces of the metagame such as Mega Lopunny, Mega Heracross, Mega Abomasnow... nearly every relevant mega, in fact! Necrozma, and Tapu Bulu look like great additions in particular. Will Diggersby and Snorlax be banned again? Will Chanslugg still be the defensive core of choice, despite its passiveness? How will Necrozma fair with Photon Geyser? All questions that open play should answer soon!
INVERSE COUNCIL
E4 Flint
Klang
OM room
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