→Petting: Grammar check
The player may pet their Pokémon by using the touch screen to rub it. All Pokémon that can be petted have places where they especially like being petted and places where they dislike it. Petting a Pokémon increases its affection—shown by hearts that appear over its head—as well as its enjoyment, but if its enjoyment reaches its maximum, no affection will be gained. Petting a Pokémon in a spot it dislikes also will not increase affection. Initially, when a Pokémon has 0 affection, however, all pettable spots on its body are treated as neutral spots. Rapidly tapping the screen in succession may also hit the Pokémon, which causes an angry reaction but does not affect its stats.
Some Pokémon also have special effects on parts of their body, such as a slimy body or a sharp edge. Some of these are mainly aesthetic effects, while others may temporarily prevent the player from petting the Pokémon in reaction. Several Pokémon may have their entire bodies produce these effects, either preventing them from being petted in a favorable spot or petted altogether.