Theoretically, you could just EV train the bad stats to an acceptable level (or max them out), but that can be very time-consuming. That and I'm not sure if there are even any places to EV Train in Tweaked (I'm one of the few that still haven't played it).
Otherwise, I'd just catch another one / reset until I get something acceptable (unless this is a Nuzlocke, in which case EV Train it, deal with it, or use it as fodder at some point).