Instructions
Equip your Pokemon with a Soothe Bell. A Soothe Bell amplifies positive changes in your Pokemon's friendship level.
Feed your Pokemon Protein, Iron, Calcium, Zinc or Carbos until your Pokemon cannot consume any more.
Travel to a long and straight stretch of road, and then walk or ride your bicycle back and forth from end to end. For each 256 steps that you travel, your Pokemon will become a little friendlier.