That has nothing to do with this. This just sounds like your own feelings.I don't think Mario has become less popular so much as the games have stagnated because of uninspired game design + Nintendo's desire to ruin Paper Mario.
Remember Pokemon Go came out and introduced/reintroduced new fans to the series. It reached a general audience that had never touched the main series and I'm sure many of them are interested in the main series now.
Also no other game has had this many trailers. It always ends up at the top of Reddit (9th most viewed website),YouTube (4th most viewed website) and other sites when they post a trailer each week. They know how to hype this.
Sounds *good not "well"My... the name Decidueye is... even weirder than when we thought of Entermaid before. At least Ashirene/Primarina actually sounds very well.
Finally, it is truly confirmed once and for all.