Okay to do this first of all you'll have to have a pokewalker with the game pokemon ss and a ds/dsi.
then connect the pokewalker with the ds/dsi with the game in and youll see some courses.
you can get more couses which unlock couses with rare pokemon
here are some some courses and how to unlock them
please thumb me up:) btw by walking with the pokewalker you gain watts which unlock the courses
p.s. i got this info from serebii
|Refreshing field-(doduo,kangaskhan,nidoran the girl one,nidoran the boy one,pidgey ,sentret||automaticly unlocks|
|Noisy forest-(bellsprout,wobbeffet,paras,venonat,spearow,oddish)||automaticly unlocks|
|rugged road-(onix,magby,machop,ponyta,geodude,hoothoot||PK (pokewalker needs) need 50 watts|
|beautiful beach-(psyduck,staryu,poliwag,slowpoke,sunkern,wooper)||PK needs 200 watts|