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So, I just caught a Poké Ball Vivillon.
Actually, a while ago on my Gateway 3DS, I hacked save data so that system had a Fancy and a Poké Ball Vivillon, and I set them as that Mii's support pokémon.
When I streetpassed my Gateway 3DS, my main 3DS now catalogued Fancy and Poké Ball as spotted.
And it's possible that in doing so, I can now see them in the wild myself.
This could actually work like the Eon Ticket deal and give actual important purpose to the whole Support Pokémon deal.