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This is the team I used to clear Sapphire, the Elite 4 and Steven were surprisingly tricky, I wasn't planning to level enough to evolve mence but it just kinda happened.
Shedinja is actually clutch vs Steven. It walls metagross and aggron so if you can eliminate skarmory before it sets up spikes you only have 3 other pokemon to clear. Also steven likes to swap in aggron early so you get free chip damage when he has to switch it back out.