The Strength of Steel Ultra Unlock event is now available for Pokémon Go players, and it features the Heavy Metal Collection Challenge. As with previous collection challenges, the goal is to collect a select number of Pokémon before the event ends.
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There are only a handful of Pokémon you need to catch for this collection, but half of them require you to reach the final evolution of the Pokémon. The amount of candies you need can be a deciding factor in the Heavy Metal Collection Challenge in Pokémon Go, but there are a few ways to make your life a lot easier.
There are only four Pokémon that you need to collect to complete the Heavy Metal Collection Challenge. However, you have from July 25th to July 30th to complete it, or you will miss the chance to collect the rewards during the Strength of Steel event. There are two Pokémon that you need to catch, and then you need to reach the final form of that Pokémon to complete the challenge. It all comes down to earning enough candy to evolve that Pokémon.
These are all the Pokémon you need to catch and evolve to complete the Heavy Metal Collection Challenge.