Earlier generation legendaries in Scarlet/Violet?

According to the Japanese Wikipedia, some legendary Pokémon from earlier generations can appear in certain areas around Paldea when you get a snack from your mom or something? I tried to see if I could find Latias once but she didn't appear. Is this true, and can you even obtain non-G9 legendaries? I would love to have the Tao Trio on my team.
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I think some NPC named Snacksworth makes some lunchboxes for Legendary Pokemon (for all the previous gens except for G6), provided you do a certain number of missions. Some of the legendaries are only found in one version, so it's best to join Union Circles with friends who have both versions. Unlocking the non-version-exclsive legendaries is a bit trickier, though. You can get the Tao trio on your team — just look up a guide first to see if you're doing it right.
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Plus, nice and warm…
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Mmmm ok
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Catching Reshiram rn
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Thank you very much ^^
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Already got Reshiram ^^
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I feel safe with my Reshiram around
So fluffy!
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This is a message I sent to my family's PoGo group once
And have you considered that it's a fire-type, meaning its body temperature is most likely high? So that means that you would easily go to sleep next to Reshiram because it's huge, fluffy, and warm.
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