I was hosting a game of battle 1 when some guy named 'neobeo' joined. I started fighting him and after a while he would automatically home in on me, as if I had a warp target stuck to me. I used lure and bait methods to see if it was lag or a trainer. Sure enough, it was not lag. I gave no warnings. Just typed "CHEATER." and "BAN 2".

A harsh method perhaps, but they have to learn that cheating, to put it bluntly, sucks.