Why didn't the movie studio make a real Pokemon movie based on the original cartoon?

They probably thought that no one would see it, because everyone has already seen that story.
Plus, try finding good child actors.
And then you end up with a film starring children, with an audience consisting mostly of people in their late 20s and 30s.

i dont think Ash looks like a child, he looks like a teen.

They calculated based on profitability factors. Curious if they got their money back and more which if that’s the case vindicates the producers.

I also heard that the Dragonball movie was a flop too. I haven’t watched either.

Into the Spider-Verse is the second best Spider-Man movie ever made in my opinion, only behind Spider-Man 2. You’re missing out. Plus, it’s based off of pre-existing comic book material, so I don’t know why you consider it to be blasphemous.

As for Pokémon though, I completely agree with you. The original characters are really likable, so it’s strange that they would center a Pokémon film around a human character no one has any interest in. Also, I feel like an ensemble cast would have benefited the movie.