I spent quite awhile gathering resources to make a couple dozen cannon balls.
Made a nice little Rock Elemental trap for the lvl 92 I found not far from my base.
Lured him into the trap, jumped on the cannon and started wailing away at him. It took longer than I thought, but knocked him out.
Flew back to my base and got some sulfur ready and started my starve timer.
Waited.
Flew back to him hours later and tamed him. Set him to follow me and my ptera on our quick walk back to the base.
Uncovered anther lvl 20 on the way back ... which quickly destroyed the lvl ~138 I was trying to get back to the base.
Easy come easy go.