Buddy System

https://dotesports.com/news/how-to-get-best-buddy-status-in-pokemon-go

Buddy Status Requirements    Reward

Good Buddy One Heart You’ll be able to see your Buddy Pokémon’s mood on its profile page

Great Buddy 70 Hearts          Your Buddy Pokémon will find presents around the map for you

Ultra Buddy 150 Hearts Your Buddy Pokémon will bring your souvenirs

Best Buddy 300 Hearts Your Buddy Pokémon will gain a CP boost in combats

Whenever your Buddy Pokémon is feeling excited, the distance it takes to find Candy will be cut in half. You’ll also start earning double hearts for each Buddy action you complete with your Buddy Pokémon.

If you start gaining Best Buddy status with some of the most powerful Pokémon at your service, they’ll be even more powerful in battles. Once you achieve Best Buddy status with some of your most-used Pokémon, you’ll be able to come up with different strategies before Raids or Gym battles.

To maximize your time and gain Best Buddy status with your Pokémon, you’ll need to complete the following routine daily for around 13 to 14 days.