I think the last episode was the best ending for Ash's endless journey.
About Pokéshipping, maybe it was a bit disappointing in the end, but yet we have the second episode of Mesaze Pokémon Master, where Ash and Misty interactions was full of Pokéshipping hints and their characters were just so full of life like in the OS. Their faces, their way to tease each other will be always memorable and a stone in the whole serie, since the very first episode. So I think these things, some episodes, Pokéshipping related, will be always there and we can watch them everytime we want, and dream about them, like If we're kids again watching TV and we can ship our favorite couple, AAML and first OTP, for the veterans. An we can add some hints we haven't seen the first time, re-watching all the episodes. And I think it's beautiful.
And remember too Misty is the first and the last Ash's companion, that was always along his side, no matter what, in his worst times and in his best times, in the beninning and in the end, because Misty was, she's and she'll always be Ash queen of hearts, on screen or in our minds, in our hearts and in our souls.