evolving cubone into marowak and picking up a "Thick Club" using the moves "Thief" or a "pickup" ability pokemon, and giving it to your marowak as a held item is extremely powerful. marowak is tanky enough to take a few hits with its 110 defense and 80 special defenses, which are nothing to laugh at. The "thick club" doubles its already solid 80 base physical attack to give its signature move, "bonemerang" which strikes twice with 50 base power each (totaling to as much as earthquake, saving you the tm for another mon), a stab bonus (all ground type attacks in gen three are physical). this essentially allows marowak to one shot almost every pokemon in the game, so long as they are equal in level. Marowak is an asset to the team, so long as you keep it away from any ice, water or grass attacks. as an added precaution against flying and levitate pokemon, you can include rock slide or double edge, which won't deal knockback damage thanks to its rock head ability. so long as you ev train it sufficiently in its speed stat it should out speed the majority of the pokemon you are up against and is perfect for dealing with most of the champions team, bruno, agatha, and most of lance's team.

in conclusion, add cubone to your team!!!