Rock Tomb has 50 power, 10 PP, and 80% accuracy. It lowers the opponent's Speed one stage. Rock Tomb's power changed from 50 to 60, its PP changed from 10 to 15, and its accuracy changed from 80% to 95%.
Stone Edge deals damage and has an increased critical hit ratio.
Which do you want high critical hit with shit accuracy or minus speed but more accuracy?
