That would stretch his multiple ability dependence even further mind you. I mean, breeder's don't need more then 22 in wisdom and charisma, but he would be better off trying to leverage his stats. I mean, improved type attacks is pretty much the only type ace feature that uses con, and granted it is a reasonable thing to dump given poison's relatively poor offensive type matchups, he would probably be better off leveraging his good stats, with either a breeder advanced class (for your character concept, chef or hatcher would work well), or maybe by going coordinator. That said, ninja has a special inroad from poison ace and would not be inappropriate.