Question

If you give a razor fang to a braviary and use something like fly, would fly then get the boost from sheer force?

Answer 1

No. Sheer Force only affects moves with added effects, bringing items into the mix does not affect that if the move doesn't have added effects.

Comments

However, if you are holding a Life Orb, the Life Orb recoil is negated by Sheer Force.

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Yep that is true, but Life Orb doesn't affect which moves are boosted.

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W8, like Sheer Force Pokémon is holding Life Orb for nothing? O_o

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No, the Pokemon gains the 30% power boost from Life Orb, but you don't get a 10% health recoil every time you attack with the ability Sheer Force.

And I know Pokemaster, just wanted to make mention of that.

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Great news for my darmanitan :D