This page lists the distance in the wild where each page can be located. Each pet always appears for a 300 meter range, so when a pet is listed as appearing at, say 2.5 km, you will also encounter it at 2.6 km and 2.7 km. Likewise, if you are looking at the 3.3 km spot, expect to also encounter the monsters listed at 3.1 km to 3.2 km.
For brevity, each monster is only listed on its first appearance location.
* Slimes only appear on first run.
** Denotes Dungeons which must be beaten before advancing.