maybe how team rocket blow up Dr. Oaks lab in the manga or something and gyms tougher like past the lvl limit of your current badge(s) ei. fighting lvl 21 ones and higher the 2nd gym leader has and so on --- CRIMSON VANE!!
It would be like "hey, since we can't defeat that brat, let's get our revenge on his/her hometown and, possibly, on his/her mom!" --- "If you want to know what a man's like, take a good look at how he treats his inferiors, not his equals." -Sirius Black