One of the Swords of Justice from Generation 5 returns in DLC for with a Paradox variant you can find and catch called Iron Boulder. This almost robotic-looking steel bull seems to be a futuristic version of the Unova Legendary Pokémon. Unfortunately, only those with a specific game version can come across this powerful creature.
Many new versions of old Legendary Pokémon have been added to the expanded content, including creatures like Gouging Fire in 's DLC. Iron Boulder is exclusive to and can only be acquired for through trading. The Rock-/Psychic-type resembling Terrakion spawns in Area Zero when you complete a specific NPC's quest.
You unlock Iron Boulder in 's DLC by registering 200 Pokémon in the Blueberry Pokédex. This objective becomes available after you finish the quest in DLC. Showing this character the completed Pokédex in the Savannah Rest Area causes them to show your character a picture of Iron Boulder for the first time.
Before you start DLC in , try to complete as many quests from as possible to have Perrin available to unlock Legendary Pokémon like Iron Boulder.
Showing you the picture allows you to find the Legendary Pokémon in Area Zero as you travel to the crater in this zone. Iron Boulder is found right below Research Station 2 in this area and can be fought immediately as you run into the beast. Make sure to stock up on supplies like Pokeballs or healing items to help your team endure a prolonged fight against the Sword of Justice variant in .
This version of Terrakion is Level 75 and has a measly 3.9% capture rate as you begin your battle with the creature. Have Pokémon on your team that can inflict status conditions such as Sleep and Paralysis to increase your chances of catching Iron Boulder.
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