You will obtain a Groudon Candy after walking 20 km with this Pokémon as your buddy.
Groudon is unobtainable from eggs.
Groudon's attacks are boosted, it appears more often in the wild, and you will get more stardust when it is caught when it is Clear.
Where to Find Groudon?
As a Ground-type Pokémon, Groudon can be found as a Legendary Raid Boss or occasionally as a reward for a Research Breakthrough.
In addition, Pokémon GO often organizes themed events — such as the Water Festival, Halloween, Pokémon GO Community Day etc — that allow you to capture this Pokémon in larger quantities.
Every month, a Community Day is held around the world to capture a featured Pokémon in the application. Bookmark this page for news and updates, as we'll be updating it often!