Pokémon Go Heavy Metal Collection Challenge: All Pokemon and rewards

The Strength of Steel Ultra Unlock event is now available for Pokémon Go players and features the Heavy Metal Collection Challenge. Like previous collection challenges, the goal is to gather a select number of Pokémon before the event concludes.

There are only a handful of Pokémon you need to capture for this collection, but half of them require you to reach the Pokémon’s final evolution. The amount of candies you need could be a deciding factor for the Heavy Metal Collection Challenge in Pokémon Go, but there are a few ways you can go about it to make your life much easier.

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