1. Click the green flag 2. Click the backpack 3. Choose as many berries as you want! 4. Choose one of the red kite things 5. Tell me what combination you got 6. Click ok 7. See if Patrat likes your pokebock!
I got the pictures of the berry blender, berries, and Patrat from bulbapedia v2: More berries & colors. v3: Can now feed Patrat