Ganyu couldn't help herself from farting so much due to her having the various flowers growing in the garden of the mansion. "Gee... guess I couldn't help myself to try out these flower items. I'm really cranking a stink storm!"
"Then you shouldn't have eaten up the items in the 1st place." Olimar pointed out while he was gathering his Pikmin and heading back indoors. "Those things have an effect on you."
"Oh I'm certain-" Ganyu tried responding only for her to blast out a huge fiery fart that burnt up her butt. "Yeowch! Guess I deserved that...!"