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FR/LG Lance easily takes the cake on this one. I've seen him use:
-hyper beam on ghost types
-earthquake on pokemon with levitate
-thunder wave on ground type pokemon
-thunder wave on a statused pokemon
-thunder wave on a substitute (actually every AI in Fire Red/Leaf Green does this)
-healing items on a pokemon I've repeatedly put in the red (ie, he uses a full restore, I put his dragonite back in the red, he uses another full restore)
-dragon dance on his own kingdra, followed by surf
-just plain terrible tactics in general, such as his gyarados using thunder wave over and over on a pokemon with substitute up, and I'm making no indication of switching any time soon.