I know Daniel is the one making the Pokemon/Little Mermaid crossover films, but since you're in charage of writing the transcripts for him, I have a scene suggestion for one of his films:
It's in Ash's Adventures of The Little Mermaid II: Return to the Sea, and it would be right after Melody runs away and sails away from home. Pikachu chases after her in pursuit. Pikachu will be with Melody thoughout most of the film. leading Ash and his friends (along with Kronk, Zhane, Korra and her friends, Jack Skellington, and the Power Rangers) to go with Ariel to find Pikachu and Melody, during the film. Pikachu keeps trying to warn Melody about Morgana (as well as the Crime Empire, Team Rocket, and Oogie Boogie), but she doesn't believe or understand him (mainly because she can't understand pokemon talk). until near climax.
I just did. And I added a moment where Ash goes off to save Pinocchio from undergoing the island's horrifying spell before joining the others in their battle against the villains. And they'll later free the donkeys and use the boat to take them back to the other side to meet up of Officer Jenny.