Partners you can get throughout the game. You can only have one at a time, so you must switch out if you want a different one
For your first partner, you have the option of either Starly, Parchirisu, and Munchlax.
For your second parter, you have the choice between Croagunk, Krickitot, and Mime Jr.
*The rest of the partners are avalible within quests/missions*
Craniados, Sheildon, Chimchar, Piplup, Turtwig, Sneazel, Snover, Misdreavus, Starly** Machop, Hippotatus, Gible
**Starly's quest is only avalible if you chose Pacharisu or Munchlax as your fist partner