Yes, there could be other things like the friendship of each Pokémon being different and more difficult or not and having a day and night system. Where at night more dark, ghost and other type Pokémon could appear, and during the day more Pokémon of other types, and there could also be more speeches and other actions after having made a Pokémon yours, and Partner and maybe be able to add your partner Pokémon, and help you collect berries if I had it at the 4th or 5th friendship level