in pokemon legends arceus, an item called the linking cord made it such that trade evolutions were possible if you didnt have switch online or friends to link trade with. in scarlet
Linking Cord - Bulbapedia, the community-driven Pokémon encyclopedia
How To Evolve Pokemon With The Linking Cord In Pokemon Legends: Arceus
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Pokemon Legends: Arceus - Where to Find Linking Cord
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