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Pokémon Shiny Diamond and Shimmering Pearl feature an NPC from Pokémon Platinum

While the visual design proved a little controversial, many fans are eagerly awaiting the release of the Pokémon Shiny Diamond and Shimmering Pearl remakes for Nintendo Switch, eager to relive the adventure and enjoy some new features in the process.
But there’s still a lot we don’t know about these releases, and fans have been poring over the videos shown of these remakes to find more undisclosed details. Recently, player voltimer found footage in the reveal trailer of an additional NPC from Aromaflor Village added in Pokémon Platinum to talk to you about the Crystal Flower and give it to you if you go with Shaymin.
This is the brown-haired girl you see in the image below:

This seems to be a sign that these two releases will include the content (or some of the content) from Pokémon Platinum, although this is only speculation until it is officially confirmed by the company.