As is common in the Pokemon main series games, there are some species that are exclusive to certain versions. In Pokemon Sword & Shield, the Crown Tundra DLC introduced a bunch of Pokemon from past generations--though, these too are subject to the version-exclusive divide.
RELATED: Every Type Of Poke Ball In Pokemon Sword & Shield & What They Do
Those found in Pokemon Shield consist of mostly legendary Pokemon and a few other powerful species. To get them, one will have to do a fair bit of
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