I totally agree with your prediction for Pokémon and movesets. Still, I don't want the Goomy line with Ash... I can see it, but meh... My prediction was the same as yours but giving him a male Meowstic instead of it, so that the strong-weak pattern that writers followed in AG would be accomplished once more... But who knows. After Clemont's Luxio I think making predictions won't be easy.
Honestly I would prefer Meowstic as well, but I'm not entirely sure what could be his Wildcard will be at this point. There's a lot of options available, I also chose Sliggoo because it hasn't been showcased yet.