Another bug:
this replay has someone trolling with Assist, setting up three layers of Spikes and Stealth Rock, then Assisting Whirlwind and Roar. Problem is, if a monster is KO'd by entry hazard damage when it's dragged out, its sprite will stay on the field. By the end of the replay Jirachi, Politoed and Reuniclus are standing on top of each other. It looks like this is just a graphical glitch though.