The process of getting Thundurus is a bit extensive as it requires players to have already made it past the main campaign and be well enough into the post-game content. By the time they’re able to access the Missions necessary to catch Thundurus, they’ll likely have already captured Dialga and/or Palkia. Fortunately, like many other missions, getting a hold of Thundurus is much like catching any other Pokemon on the overland.
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