Players have a limited time to earn the rewards for the Unova Challenge during Pokémon GO’s Evolving Stars event. The event began Wednesday at 10 a.m. and ends on Tuesday, Oct. 11.

The Evolving Stars event has a number of challenges to complete including the Unova Challenge. Other challenges include the Sinnoh Challenge, the Eevee Challenge and the Trade Challenge. Each has its own unique rewards as you can see in the tweet below.

Pokémon Go Evolving Stars: Unova Challenge

To complete the Unova challenge, players will need to have two Pokémon that use Unova Stones for their evolutions. The two Pokémon that fit the criteria are Tynamo and Litwick.

Contrary to some of the other challenges, it's not necessary to evolve the two Pokémon using the Unova Stones to complete the challenge, as they only need to evolve to the midpoint in their evolution.

The reward for completing this challenge is two Unova Stones, one of the best returns of all the challenges.

The Evolving Stars event is just the latest for Pokémon Go's Season of Light, which started back in September and has included some raids and events like the Inkay Limited Research event.

Players will only have until 8 p.m. local time on Oct. 11 to complete the Unova Challenge and the other challenges from the Evolving Stars event.

Once the Evolving Stars event comes to a close, the Festival of Lights will kick off on Oct. 14, so players won't have to wait too long for the next set of challenges.

This article was originally published on dbltap as Pokémon Go Evolving Stars: Unova Challenge .