By that I mean that if I used Sap Sipper Zebstrika and Skill Link Cinccino both on my side in a double battle, could I get a +5 Attack stat Zebstrika from that or would I only get +1?
Only +1 Bullet seed does not stack with sap sipper
Source: http://bulbapedia.bulbagarden.net/wiki/Sap_Sipper_(Ability)