Just to make a possible prediction for friday's project mew supposed finale, I've got three scenarios I've speculated in other threads;
Scenario 1) The project mew team raid battle against Mew, but are defeated by Mew, then Mew is about end them until Grookey and Goh somehow manages to calm Mew down enabling Goh to befriend Mew and catch it.
Scenario 2) The project mew team raid battle for Mew, and somehow Goh manages to catch Mew in order to calm it down. He then decides to leave Mew with the Project Mew team while he focuses on his dream to complete the pokedex after accomplishing his goal to catch Mew.
Scenario 3) The project mew team raid battle and lose to Mew. Goh then somehow befriends Mew but is unable to catch it. The project Mew team learn some lesson about how enigmatic of a Pokemon Mew is and realize its best to not capture it and just let it roam as some creatures are best left as a mystery. (THIS SCENARIO WILL NEVER HAPPEN!)
Scenario 4) I can even see the writing staff doing another fake-out, by having the project mew team fail their mission, only for Mew to sneakingly allow Goh to catch him towards the ending of the episode as a surprise by disguising himself as another pokemon Goh had never caught just to surprise him of his capture in the pokedex entry. As a testament middle finger up at the fans that dislike Goh.
Overall, as usual, I don't expect for any of these scenarios to happen as I'm usually wrong and tend to overestimate the story quality of pokemon sometimes.
However, based on following the start and climax of the project mew story, my best prediction is that Goh will catch Mew and may decide to leave it with the Project Mew Team to research it in a humane manner. After all, like Ash, Goh aims to accomplish his goal (catch Mew), and he's also apart of research team which has ambitions to study it. Reminiscing Professor Oak's lecture to Goh to joining project Mew in the beginning, Professor Oak felt it would be a good idea if Goh could share his dream with others (Project Mew).
As for the future of pokemon anime, I expect Ash to continue to travel the world and eventually visit the gen 9 region, while catching more powerful pokemon such as Legendaries and Mythical types. Because Ash is now ranked as the strongest trainer in the PWC tournament, I see no point in the anime continuing the traditional story format of Ash having a starter pokemon or catching regular regional pokemon, especially since he should be more than capable of taming wild legendaries just to show off his tenacity as a Monarch.
I think journey's hinted to this concept becoming part of a future story after showcasing Ash battling and losing to numerous legendries showcased in Journeys (Mewtwo, Articuno, Moltres etc) as well with Leon losing to Eternatus.
