So now we moved to the successor generation of XY?
And the people are also speaking that Ash don't catch feline pokemon or even canine, either another rodent besides Pikachu, (surely Raticate doesn't count), I agree with that, just because of the historic generations, and because the pattern-breaker-queen-generation XY couldn't even break that pattern of Ash catch those types of Pokemon.
About the successor generation of XY, and about Ash's captures, I think that he will caught 2 starters just because the historic too:
AG- Caught Treecko
DP- Caught Turtwig and Chimchar
So...
XY - Caught Froakie
SM- Maybe catches the water and fire starters, but grass type, could be like Buizel in Dp, or Skiddo in XY (if he had caught Skiddo).
But about Sun and Moon I'm not very excited about, just because I know that they broke some traditional patterns in XY that I liked so... Then in Sm Ash could not catch the grass type again, or not catch the water, fire, or regional bird, once they began break patterns after 5 generations. so in 7th generation more others patterns can be broken, and another reason why it's because I don't think the anime of S&M could be better than XY (even XY with no grass type). I really think XY is the 2th best generation after Dp, however what I want it's that Sun and Moon surprises me, like XY surprised me after the mess that was 5th generation.
What we learned in XY? Don't count on traditions or patterns.