For the Season of Legacy in Pokémon Go, the first event arriving in December is Descent of the Dragon's Spiral, with the debut of Druddigon. You will be able to encounter this Pokémon in several unique ways during the event. Since Druddigon is a Dragon-type, make sure you can catch him now before he disappears. Here's what you need to know about how to catch Druddigon in Pokémon Go.
There are two methods of encountering a Druddigon. The first and simplest method is to find a three-star raid. Druddigon has a chance to appear as a fighter for these raids, and as it's a three-star match, most players should be able to defeat him on their own. However, this is not always the case and you may need a friend to help you if you are lower level or don't have the best Pokémon to counter it, such as Dragon, Ice, or Fairy-type Pokémon.
The other method is through field research. There are three tasks for the Dragonspiral Descent event and these have a small chance of giving you a Druddigon encounter rather than the traditional one. You'd better focus on three-star raids due to how rare it is to receive a Druddigon encounter from field research activities.
We don't know if Druddigon will be added to the raid rotation for the season or if he will appear elsewhere after returning to the wild following the end of the Dragonspiral Descent event, which ends on December 12.