Uh no I’m serious, why wouldn’t Nintendo advertise another popular Gen 7 Pokemon? Unless it’s an iconic Kantomon like Eevee or Gengar so I don’t see the harm in including Decidueye or Primarina.
I mean, we literally have 3 Awakening characters in Smash already when Chrom, Lucina, or Robin could’ve been enough.
And Rex clearly isn’t getting in.
Awakening, despite how some longtime fans feel about it, is pretty much
the Fire Emblem game though, not only did it save the series, but it became the outright most successful Fire Emblem game, drawing in the casual crowd like it had never done before. It really set its mark on the series, for better or for worse you can pretty much divide Fire Emblem by pre- and post-Awakening.
There's really nothing special about Gen 7, it's just another Pokémon generation, once Gen 8 is underway it'll lose all special treatment and will just blend in with the rest. Gen 7 is fortunate enough that it even got a playable Pokémon, it's more than what Gen 3 and 5 can say, and the timing was really close to it missing out.