Server: Blue, Yellow, not tested on Red.
Not quite sure if this is considered a bug, but if you are using an electric pokemon with Levitate (I was using a very weak Tynamo) against an npc's pokemon that knows a ground attack (Giovanni's Nidoking and Red's M. Charizard - both know Earth Power), the npc controlled pokemon will just spam it's ground attack, endlessly missing. Made a few fights I should have lost very trivial.