I believe it's perfectly OK, if you're already going out with someone, to ask them to help you calculate the child support payments you will be seeking from your ex. Especially if they're more mathematically inclined than you are.
But if you've met someone online and haven't even seen each other in person, to request a telephone coaching session in negotiating your divorce settlement? Hmmm, not so sure. I'll have to ask my grandmother how they did it in her day.