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I also wanted to point out that ORAS RU faced a similar issue back when Dugtrio was still here, with Alomomola+Dugtrio cores. Although full stall wasn't really used, the principle was similar, in that they used Dugtrio to trap anything that could threaten Alomomola. They suspect Alomomola, but didn't vote to ban it, they suspected Dugtrio shortly after, and banned it. Afterwards, Alomomola hasn't been a problem for the rest of ORAS RU lifespan, and I think the same would probably apply to Mega Sableye as well, if Dugtrio were to be banned.