(SPOILERS IF YOU AREN'T UP TO DATE WITH SUN AND MOON)
You know what, I can be disappointed at the sun and moon league all I want, I can hate the writers for how they treated the plot with all the passion in the world and I can definitely feel pissed that Ash had won this league instead of others to the end of my days.
I cannot however deny my happiness for him. Sure, he got there with a "bit" of "luck", but still after 22 years I just can't help to put on a smile after the battle concluded. I didn't watch the pokemon anime live for years now, I watched it back 3-4 years ago. I remember all the defeats in the league. Ultimately stopping at the start of XY, can't even remember why. I'm glad I picked it up again. Even if sun and moon isn't my cup of tea, it made my day today. I can only hope we'll get to see the journey that awaits you ahead, and if not, then Ash Ketchum, I can only hope that you reach your eventual goal of pokemon a pokemon master.
Now that you've finally completed the sun and moon adventure, (hopefully) will become an official champion after beating Kukui and taken a massive step in your journey, get your ass back into Serena's arms.
Thank you.