I'm not sold on what this would provide over sketchmons or stabmons. It honestly feels like a somewhat limited mmixture of both; where mons that resist their own typing get free strong moves (as Schpoonman said) and extra coverage to nail the mons that would like to wall them. Meanwhile things without useful resists will just not be used.
The entire concept is kind of broken, and banning moves is really awkward because your "ban all normal moves" idea didn't just ban moves already learned, but ALL normal moves in the entire game. Besides the obvious utility issue, it got rid of any possibility of Normal STAB for every normal type besides loldelcatty and every -ate user except Golem-A and Aurorus can't use -ate.
As a matter of fact most things don't get STAB, which will lead to offense being unable to use most Fairy/Fighting/Ghost/Normal/Bug/Flying/Dragon/Ground/Rock types.
A typical offense team (assuming similar move bans to STAB/Sketchmons so no Shift Gear Kartana lol) would probably have something like
- Greninja (Blue Flare/Steam Eruption/Ice Beam or Freeze Dry/Nasty Plot or Dark Pulse)
- Tapu Koko (Bolt Strike/Dragon Ascent/U-turn or Dragon Dance/Close Combat)
- Kartana (Bullet Punch or Dragon Dance/Power Whip or Wood Hammer/Sunsteel Strike/Diamond Storm)
- Keldeo (Stealth Rock/Taunt/Steam Eruption/Ice Beam or Freeze Dry) or some other hazard setter idk
As for stall... well I didn't look at that as much, but Grass and Bug are the big names in recovery. Flying resists will be very common as well thanks to access to Defog and Roost.
Notably if you did ban Steel types the only usable defensive mons currently in UU, BL, or OU that could remove hazards would be Nihilego, Zapdos, Rotom-W and... does Tyranitar count as defensive? Zapdos will probably be good with Grass moves, U-Turn and Oblivion Wing, but Rotom would probably rather have its Electric moves than Flying moves, Tyranitar loses basically all of its offensive presence with its Rock STAB, making it rely on Dark moves and Fire coverage, but has a decent bag of defensive tricks including Toxic Spikes, and Nihilego lost its good STAB as well. Below them you have Diancie and Rotom-H for Hazard removers. Rotom-H seems good, gets both STABs, but is weak to SR.
Other defensive mons of note are
- Tapu Fini, which has most of the same moves as in OU barring Moonblast/Nature's Madness and Defog, but gained Recovery and Quiver Dance.
- Ferrothorn, which has both STABs, Stealth Rock, reliable recovery, Status, and Grass moves
- Magearna, which gets Fairy STAB, recovery, Haze/Heart Swap, Grass moves and Hazards
- Latias, which gets Psychic STAB, recovery, Grass moves, Will-O-Wisp
- Muk-Alola, which gets dual STAB, recovery, Grass moves, and Toxic Spikes
....
I honestly had more fun theorymonning for this than I expected (this was going to be really short lmao). But I stand by what I said about this meta not differentiating itself enough in positive, interesting ways from existing move-based metas which are already floundering due to lack of activity. I'm not sure the basic idea is right for OMs at this time.
Ignoring that, I recommend keeping an open mind on banning Normal*, not banning Steel because you ruin any attempt at defensive playstyles (especially hazard removal as I showed), and possibly letting mons keep their base movepools. I'm a bit hesitant on the last part because while it would solve some of your problems like the limited pool of mons with viable STAB options, it also removes what I think is the most unique aspect of your meta.
*but ban like Shell Smash and stuff thats borked
If I can clarify anything please ask, this was written kind of all at once and without much organization and my mind does wander.
