Mine knows:
Earthquake: High power, high accuracy, double damage against digging Pokemon, works well with Mold Breaker, used to deal with Steel types.
Stone Edge: High power, STAB, good chance for critical hit.
Crunch: Good power, high accuracy, decent chance to lower defense, type coverage.
Rock Polish: Helps raise Rampardos's low Speed stat.
Rampardos learnset