WeeklyBattles claims to be a professional hill-buster. If he is in fact a professional, he should be able to bust the largest hill in the world.
This is Cavanal Hill. It is 1,999 feet or 609 meters tall. I couldn't find an official length so I'm using pixel scaling because I can do that.
1200/191 = 6.28272251309
6.28272251309 x 609 = 3826.17801047 meters for the length
Going to assume the width is the same as the length because if you at any point thought this was a serious calc you were absolutely right.
609 x 609 x 3826.17801047 = 1419056726.7 m^3 or 1.4190567267e+15 cm^3 for the volume of Cavanal Hill
Again, this guy is a professional, so he should at least be capable of atomization
1.4190567267e+15 x 30852.2 j/cc = 4.3781022e+19 joules or Island level or 6-C
But this is WeeklyBattles we're talking about so probably a Sub-Atomization
1.4190567267e+15 x 5.403e+13 = 7.6671635e+28 joules or Large Continent level or High 6-A
OVO