Basically, the higher ranked Pokemon you write for, the closer you need to stick to the prompt in order to get a prize Pokemon of equal rank to the Pokemon you're writing for, if that makes sense. Hopefully that helped answer your question. :3 If it didn't, I'm sure Hannah or one of the other graders will correct me. xD
But I see that you have crime with a crossover, so if there's any shows/anime/manga/insert something else here that you like, maybe try to fit that in? If there's another thing you're interested in that involves crime, maybe use that as inspiration? Hopefully that can at least help you get started!