all of the Regi's have a Gem-O-Meter: Red&Pink= Corrupted or Mega Evolved Black=Dead or Mega Evolution Defeat Black&Bright Blue=Purified
Mega Registeel: A Hidden fact you probably didn't know was that Mega Registeel can only survive with the reddish pink energy inside its mega gem, that's why you see its eyes flicker out during its animation.
