You've talked to everyone around town? Does it let you go to the Gym? If not, what does it say? Otherwise, it might be during nighttime and you talk to a new NPC? I wanna say the Gym guys quest was a real simple chat with someone and a small battle.
All the starters are "locked" to be what they are IIRC. However, not tooo long into the game you can buy mints to change the nature for most of the natures. I want to say something like modest? doesnt work as it should.