A Pokemon online game is impossible for all purposes unless you are a scripter (or can recruit a scripter) on the level of Blizzard, Mr. Mo, etc.
Seriously, building a battle system almost from scratch, making it online, editing the online components, would take a long time, and it would probably require more than one great scripter, not to mention a lot of time.
And considering there's no Pokemon script kit out that's good, you probably should just give up with the idea, or try to join another project.
Good luck if you decide to continue with this, but understand how hard it would be.