Don't need to give me credit xD . Also found one as soon you reach the Lake of Rage, I didn't edited on my post because SunRhapz had already mentioned it. That makes a total of 8 PokeStops locations known so far in Johto. Maybe there are more in less obvious places.
Make that 9 pokestops found so far :) I just found this pokestop on route 45 at the entrance to the Dark Cave.
So far these are all the pokestops that we've found:
1. In Violet City, near the entrance to Sprout Tower. (x:42 y:12)
2. On route 32, where you enter the union cave. (x:11 Y:139)
3. In Azalea Town, on the way to the slowpoke well. (x:49 y:16)
4. In ilex forest (x:6 y:72)
5. At the national park (x:42 y:25)
6. In Ecruteak City, near the Burned Tower entrance. (x:20 y:10)
7. In Olivine City, near the Lighthouse. (x46 y:33)
8. At the lake of rage (x:44 y:48)
9. On route 45 by the dark cave entrance (x:9 y:6)