Oh lol, I guess I wasn't clear. In terms of likelihood, the only one up there with Amour is Poke simply because it was the first and most known (height of the show's popularity) and there's enough mutual hints in that. But even that assumes the show's ending, or at least Ash as the MC, is years away. If the show ended tomorrow and you had to place bets, of course it'll be Amour. Hope that made sense.
Ash's hints have always been an interesting part while discussing about Ash-ships and their mutuality. For me, Amour has just as much strong hints from Ash's side as in any other Ash-shippings including pokeshipping. It's just that these hints he has shown is very different because his personality itself is very different in XY/XYZ series. XYZ Ash is the most serious and mature version of him we've ever seen. Even that "science is so amazing" running gag with Ash and Clemont was dropped in XYZ. Ofcourse, it would influence the class of shipping hints he'd have with Serena. He had many meaningful mature conversations about goals, future plans with Serena, he postponed his last gym battle for Serena, got snapped out of arguably his most depressed self because of Serena before mastering Ash-Greninja and most importantly he acknowledged the catalyst Serena was behind all these by thanking her, had moments with Serena in XYZ-45 (which some people call the date episode done right) and finally those sparkling eyes in XYZ-47 as a reaction to Serena's unexpected kiss.
Sparkling eyes have defined many iconic moments in the pokemon anime before like when May got separated from Manaphy, Misty releasing Togetic, etc. It was a perfect reaction of Ash keeping his current personality in mind from the writers/director of XYZ. My only complain with this was I wish it lasted bit longer from Ash's side. Other than that, it was a perfect conclusion of ship from Ash's side. His smile after the kiss is ambiguous but to me it seems to suggest that Ash is finally aware of how Serena feels about him. He wasn't sad because Serena herself wasn't.
Honestly, I'd have hated it if Ash had blushed following the kiss and I might be the only one in this thread who would have felt that way. Because it would just feel so OOC for Ash to blush, he hasn't in nearly two decades. I would like Amour to feel natural with both characters dropping hints which suits their character, blushing fits with Serena but to XYZ Ash it doesn't. Who knows? Maybe Alola Ash would blush if Serena returns and kisses him XD. About the absence of Ash's jealousy in Amour, I'd say I never saw Serena giving any reasons for Ash to get jealous by ignoring him for any other dude like Misty did in Orange Islands. But, that's just my opinion.