Thank you for the thorough reply. Your two side notes are good points and I’ve added quick notes about them to the main post.
And thank you for that Shellder Pearl method. Posting new methods is also appreciated. Unfortunately however, I just happened to update the guide with a faster pre-Sonata City money farming method, and then afterwards I saw your post. It’s regarding Elder Clint Eastwood in the Dexnav, and due to his Pokemon’s set and the AI, you can beat his team (and get $2400 per battle) before you even get to Midna Town. Again, new ideas are always appreciated and thank you for the post.