That would explain why Magnitude's power varied randomly: seismic waves differed at every moment and in every location, so the power produced when a Pokémon channeled and amplified them differed as well.
In other words, the Pokémon using Magnitude acted as an amplifier with fixed parameters, while the variable was the ever-changing seismic waves. The move's power therefore changed with those waves—in effect, randomly.
By the same logic, Earthquake should work similarly. The difference was that it had two variables: both the Pokémon and the seismic waves themselves.
Of course, there was another point. Magnitude was fundamentally beyond its user's control, whereas Earthquake was different. Its user had control over the quake itself, so it should be harder to execute but relatively less dangerous.
Thus, the key to Earthquake and Magnitude lay in grasping seismic waves and strengthening one's own ability to amplify them—in other words, the power of the earth contained within oneself. That was what truly mattered.
That was the core value of the move Earth Power.
One could even speculate, in theory, that the essence of the earth power within a Pokémon was also a kind of vibration, one whose amplitude could be adjusted. That was why, once adjusted, it could amplify seismic waves of different amplitudes.
And if he broadened his thinking further, vibrations existed within every living thing—even within an inorganic stone.
That was the so-called power of the earth, or rather, the primal force of the earth!
If Dian's conjecture could be proven, then the earth's primal force was everywhere, existing within all things in the world—and beyond them!
And among Ground-type moves, there really was one that embodied this primal force of the earth, otherwise known as Land's Wrath, a move mastered only by Zygarde.
Most other Ground-type moves could be considered extensions