Many years ago, someone stole Rustwyrm’s’ prize motorcycle, causing him to be kicked off Bicycle Bridge. He tracked the thief to the PAX Pokemon League, and has fought his way to the championships, in hopes of finding the thief and getting his motorcycle back.
Look out Champ, even though he doesn’t have his motorcycle anymore, Rustwyrm still behaves like a Biker. Which means he uses primarily Poison Pokemon. Use Ground or Psychic attacks against him, and bring in Steel Pokemon to resist poison effects. But be careful, Rustwyrm still has some tricks up his sleeve. Also, watch out for Toxic and Toxic Spikes. If you manage to do this, you’ll get yourself the Wheel Badge (He’s not bitter, he swears!)