You're not the only one considering trying a scarf mamo :PI see what you did there haunter.
There are several non steel types that can sponge his meteors and do something nasty in return. You need a rough minimum of base 110 HP and 80 special defense to tank one, and possibly a second depending on damage rolls. An inverse stat layout would work too, but I haven't done calcs for that. Something like 70 HP / 120 Spdef...
Notables:
Cresselia
DM fails to 2HKO specially defensive cress. If the drop didn't occur it'd still be a 3HKO. Cress has moonlight and thunderwave to cripple it. You can also run trick as a failsafe, make cress a special wall for stuff like rotom-W as well. Moonlight nerf sucks though.
Chansey
Softboiled and twave. Standard max hp and def spread is 3HKOed by psyshock.
Gastrodon
Can tank DM and recover stall. Toxic and ice beam if you want.
Mandibuzz
Easily tanks DMs, but not with rocks up.
Reuniclus
Implausible/unorthodox, but possible. Specially defensive set can use recover, twave, trick, trick room and shadow ball.
Snorlax
Band pursuit.
Or you could just fodder something and revenge it with scarftar. I'm sure weavile and scarf metagross would work too.
It's a shame that nobody uses mamoswine. Tie a scarf around one of his tusks and he becomes a phenomenal thundurus check. Icicle crash flinches are great too.
Hell, I run shard, spear and crash alongside EQ. I don't really need stone edge, and all three moves have specific uses.
what set do you use? I figure crash, eq, stone edge but what's the fourth since it isn't superpower? Double edge/body slam? (you can do whatever you want with smeargle daddy)