Going through Castelia City was making Bianca think a lot; certainly enough to make her stink for her farting was allowing her clout through the enormous city, with people and Pokemon making their way to allow her through.
"Wow; I didn't think people would be so courteous to just let me go by!" Bianca said in shock while casually fanning the pungent eggy air she let loose from her fart factory. "Maybe I should load up on the fiber and make up more so I don't feel crowded so much! I much certainly rather be bloated from my wonderful fart gas!"
Oh that silly gassy girl.