This could have gotten confusing, so here is a list in a sortd order...
Swampert: Forget "Earthquake", Learn "Earth Power"
Scizor: Forget "Metal Claw", Learn "Bullet Punch"
Snorlax #1(knows "Counter" and "Selfdestruct"): Forget "Earthquake", Learn "Fire Punch"
Snorlax #2(knows "Double Edge"): Forget "Brick Break", Learn "Fire Punch"