Professor Oak did not invite me to Pal Park on Diamond when I got National Dex?

Why is that?Yes I defeated the Elite 4 and got National Dex but when Rowan gave me the national one he took off(Oak) is something wrong?
Professor Oak did not invite me to Pal Park on Diamond when I got National Dex?
No. Just go to the pal park. Its the green dot on the map southeast of Sandgem.