The Imposter
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Due to how Mega Stones work, the only way they can possibly grant invincibility to the bedrock is through an ability. Thus, we can assume that Bedrockinite gives an ability shielding all damage. There is an ability called Mold Breaker, which nullifies these abilities (for example, Mold Breaker Earthquake hits Shedinja). I use a Mold Breaker Rampardos Head Smash to bypass the invincibility and hit the bedrock directly.