Pokémon GO is refreshing its Weekly Challenges feature by adding matchmaking that lets players team up with others they are not friends with yet. The update is entering a phased rollout starting today, gradually opening the door to easier group play without needing existing connections. This change should make it simpler to complete challenges, especially for players who prefer jumping in solo or live in less active areas. By lowering the barrier to collaboration, Weekly Challenges could feel more social and more accessible, encouraging players to engage more often and connect with the broader Pokémon GO community.
Source: Official Pokémon GO blog