Hi there, that's a pretty interesting crossover idea.
I'm also huge pokemon fans, been following it till the latest sword & shield. I also have a thing for Godzilla and Japanese Kaijuu.
As for my writing skill, I'm a webnovelist myself and has amass quite experience in it. I can write it out for you in a flash, but I firmly believe that Quality stuff can't be rushed thus I would love to discuss it further with you, about the character, plot, and climax.
If you're not satisfied with it, I can change it untill you're satisfied with the story I wrote.