PerfectPokemon.com is a competitive Pokemon Scarlet/Violet Community. Buy/Sell/Trade battleready Pokemon in the Marketplace. Compete and earn badges in the online Gym Challenge or simply meet and mingle with other friendly Pokemon Fans.
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All you need to do is deposit Pokemon from X/Y into your bank. Then switch out the cartridge (not required for digital versions,) and withdraw those Pokemon to OR/AS. Hope this helps!