Your opinion is subjective and all personal preference. Imo Kalos League is one of the worst leagues due to its terrible pacing and horrible opening episode. You can’t just go to the semi finals in the second episode and lose to the next. If you don’t see the narrative behind any of those battles I recommend you rewatch SM since a lot of people in the anipoke community see the real meaning behind most battles. Kalos league is only considered good because of its flashy battles. Which is why I consider it to be all hype not actual good writing. I can go off on some of the narratives behind each battle but seriously it would take way to long. I recommend you go see Kaito’s review he explains it nicely - http://aminoapps.com/p/xzrlgq
And in Origins and Masters he has Charizard. If you want to argue about Lets Go being canon, then you also have to accept that Red isn't the canon protagonist of Kanto and Jessie + James are a thing. I don't see how it holds more water than Masters honestly which still counts as a game fyi. Artfx are even selling statues showing him with Charmander.
Did they ever give a reason why they released it this way?