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At the end of the trailer we see Florian and Juliana unleashing Koraidon and Miraidon's signature moves, then we see Terapagos entering its Terastal Forme and apparently using its signature move too, THEN, Florian and Juliana use their Tera Orb and the next thing we see is this.
At first I thought it was just a flashy reminder of the gimmick for us and then a tease of Terapagos' final form, but if you look closely, you can see the skipes of Koraidon's tail, so we are actually getting Koraidon and Miraidon into the 19th teratype for the story.
But if the 19th teratype is only that, another teratype, why are they hidding Koraidon's body? They already revealed the appearance of the full tera jewel so we already know what any pokemon would look with one of those crows... unless these change the form of the pokemon on top of giving them a tera crown.
Tera forms are fucking happening