Someone on twitter suggested that a betrayal might happen within Project Mew and i found that interesting, because if one of these character were to try to catch Mew while working for TR, it would be a great way to bring back Giovanni.
Since Goh seems to be asking Ash for help, they could have him finally beat Giovanni.
That would certainly be a less anticlimatic ending, but it's just my wishful thinking.
Definitely. That would be the best possible ending for journeys.
Ash receiving a call from Goh sure means he’s in trouble. Whatever happens in this episode is going on at the same time as Ash’s battle. Amaranth seems to have plotted all this to get Mew for his own, or maybe for Giovanni.
After his failure with Mewtwo, he wants to try to replicate Mew once again or even keep the original. Ash, Chloe (and probably Dawn, unless she has already left to Sinnoh) go to Table Mountain to aid them and solve the Pokéball hijacking, probably caused by Team Rocket. One final turn of Jessie and James to the good side would be nice, and also Ash defeating Giovanni’s Persian with Pikachu.
In the end, Goh decides that Mew has to remain free, and proposes to create “Project Legends”, in which the team has to find and research mysteries about legendary Pokémon around the world, with the sole purpose of investigating them instead of catching them.
Chloe joins the Eevee Research Institute to study Pokémon Evolution or goes with Dawn to Sinnoh to be Serbal’s assistant (as he is specialized in the field).
That would be a decent ending imo.