The top right advances it by that amount yes :)
When the roamers are regenerated post-E4, their stats are created via Method 1 on the following frames:
1st roamer: frame 1
2nd roamer: frame 6
3rd roamer: frame 11
The order for regeneration is Entei -> Raikou -> Lati@s. If all 3 roamers have been released and KOd, then defeating Lance will respawn Entei with frame 1's spread, Raikou with frame 6's spread, and Lati@s with frame 11's spread. If Raikou has been caught and the other 2 have been KOd, then Entei will respawn with frame 1's stats and Lati@s will respawn with frame 6's stats. If Entei is still roaming and the other 2 have been KOd, then Raikou will (probably) respawn on frame 2 and Lati@s on frame 7. The extra offset on the last example is due to the fact that having Entei on the map will cause the frame to automatically advance by (at least) 1 when the game starts.
I copied that bit from the first page of PRNG