Known Pokemon Scarlet and Violet leaker Riddler Khu has posted an image of a Hexagon, asking their followers what they think it will grow into, and this is likely a major hint at the upcoming DLC. As many fans know, Pokemon Day takes place on February 27 and many fans are expecting Pokemon Scarlet and Violet DLC to be revealed there. If nothing else, Khu's recent leaks may hint at this too.
For the uninitiated, Riddler Khu is perhaps the most prominent and consistent leaker in the Pokemon community. They have leaked clearly accurate information regarding several Pokemon games, including for Pokemon Scarlet and Violet's launch, and so their teases for DLC should be trusted more than other online users. They should still be taken with a grain of salt, especially as Khu prefers to play around and use riddles than post outright statements, but the latest hint has to be tied to the third legendary and/or Kalos.
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As seen below, the third legendary of Pokemon Scarlet and Violet seemingly has a series of hexagonal plates, and it could be tied to this teaser as a result. It's hard to know what Khu exactly means, but it's possible that these Hexagons (tied to the Terastral phenomenon) grow and change depending on certain factors. It could perhaps operate something like Arceus where this legendary can grow and change different types, or perhaps its form changes from the giant egg to an actual Pokemon based on how many Hexagons it has. This could also operate similarly to Zygarde, if not be related to Zygarde and potentially supporting rumors that Kalos DLC will appear in Pokemon Scarlet and Violet.
Zygarde has, prior to this new legendary, been associated with
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