[Question] What would be the easiest way to have online battles

Me And My friends were making fakemon and putting them into pokemon essentials but we wanted to make it a online battle simulator for our fakemon just within our friend group And I was wondering if anyone knew a easy way of doing it without really having to learn a whole lot of mysql

Inside Essentials? No that's probably about as easy as it comes. Maybe you could write your own netplay implementation but I doubt you'll find that easier.

Perhaps you'd have better luck making your own Pokémon Showdown server?