Is aggron an effective Pokémon to sweep with as a ninjask baton pass recipient in the emerald battle frontier?

I’ve been trying to brainstorm a bullshit proof Pokémon, that means sturdy and immune to those damn quick claw sheer colds. Other sturdy Pokémon have grotesquely glaring flaws offense wise, such as skarmory getting stonewalled by steels and magneton being able to do jack all against ground types bar hidden power grass (which is an absolute pain to grind for in Gen 3). The only major flaw I see is that his main stab move, Iron Tail has real shaky accuracy. I doubt breloom mach punches can 1HKO him