Disparities and menaces in petting
Froslass's Ice Horns cannot be touched, they will freeze you.
Rotom's energy whateveskies cannot be touched, they will shock you.
Slugma's entire body cannot be touched, he will burn you.
Ghost-type pokemon who have amorphous DO NOT have a favorite spot or unfavorite spot to be petted, as such can be touched anywhere for neutral results (Gengar-line). Other Pokémon who have no actual physical form may expect similar results.
Divided the reactions of Pokémon in 3 categories:
-Dislike- Pokémon will get angry and lose affection with you.
-Neutral- Pokémon will like being petted, but lose interest more quickly (can be petted less times if you pet it here).
-Like- Pokémon will love being petted, which allows you to pet it an additional time for benefit (3 additional hearts).
Each category makes a distinct sound, which can be used to easily determine if different Pokémon like different areas of their bodies. Upon testing, it seems Pokémon tend to dislike being touched in protruding places such as feelers, antennas, hair. Bird Pokémon dislike being touched in their legs, but love being touched in their beaks or chests. Defensive Pokémon seem to like being petted in the area of their bodies that might be used to defend (Golett's Elbows, Golem's shell, etc...)
Each time you play a minigame, you will be able to feed your Pokémon 3 Poffins and pet it 3-4 times (depending on the spot petted). If given premier Poffins (gained from Infinite challenges) they gain 5-6 hearts depending if it's their favorite flavor. Each time you participate in a game, you can gain 15-18 hearts by feeding and 9-12 hearts by petting. So you can net 24-30 hearts per minigame.
5 Affection = 250 hearts
The minimum amount of minigames you have to play in one sitting to max affection is 250/25 = 10.
The obtainable hearts can accumulate up to 2 minigames, so if you feed and pet your Pokémon every 2 Infinite games, it only takes 5 rounds of playing minigames to reach max Affection.
The easiest Minigame to SPAM Infinite challenge is the Berry challenge. The other 2 are trickier to get full scores and should be done for fun, not for obtaining Premium Poffins.