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Just tested for Steel with Steven, Jasmine and Solgaleo and it was actually very easy.
>X Atk, Solgaleo TM, Clang
>X Atk, Solgaleo TM, Clang
>Steven TM, Sunsteel Strike on Golem, X Defense
>Steven Sync takes out both sides, finish Rampardos with Iron Head/Bullet Punch spam
I used Berserker Bunch and Lockstep on Jasmine's Clang and gave both Sync Move nodes to Steven to improve his damage. Steven is also Lv130, Lv135 wasn't required.