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.