Well the way I see it there are a few options.
- Orbital strike.
Specifically a kinetic weapon, since putting nuclear weapons in orbit is banned by international treaty. These are commonly known as "Rods from God". Since our mortal enemy can only lift metric tons of material, he wouldn't be able to stop a rod from space falling on his head with kinetic energy equivalent to a nuclear strike. However, this is a rather "scorched earth" approach to the situation. We can do better.
If it's possible to deceive him, you might be able to get him close to an unstable organic explosive, and use a speaker at the explosive's resonant frequency to set it off. Or just a regular poison, if he's really not paying attention.
But this person might be quite vigilant, and determined.
If our mortal enemy is as powerful as you say he is, and if he is actively searching for you, it is only a matter of time until he finds you. The only limits to how fast he can cover ground is how long he can fly and the acceleration his body can handle.
But for the sake of argument, let's say that time isn't a factor. He has no idea that you've gone to go hide on the moon.
- Don't use matter.
Use energy. Gamma radiation is quite deadly. X-rays are good too. The hard part is projecting that energy from outside his sphere of influence. Even these focused energies will dissipate to be non-lethal from over 10 km away with our current level of technology. And if your enemy is smart, he knows how to counter high-energy photons. A lattice or grid structure of atoms would diffuse it fairly well.
But we have unlimited money. So we can make radiation bombs (read: nukes) and use the same principles of physics to wear him down. We focus the radiation from the bombs precisely onto his exact location using a network of spy satellites. But he could just go underground. Dirt is pretty good at blocking radiation.
Honestly, I think it'd be cooler if you just built a deep-space colony starship with 3D printing and research facilities - no expense spared, and left the solar system. He wouldn't be able to follow you with his limited stamina unless he built his own starship. If he's that determined though, you're going to need something more powerful than money to defeat him. Maybe another element-bender, if one of those exists.