What particle has the most energy

electrons

Explanation:

By particles im assuming you mean subatomic. The particle with the most energy in this case would be electrons.

what particle has the most energy

Explanation:

Sure, those are the highest human-made energies for particles, but we're constantly bombarded all the time by particles far, far greater in energy from the depths of space itself: cosmic rays. An illustration of a very high energy process in the Universe: a gamma-ray burst.