Reading this I agree with it.
There would be PULSEs involved in E16, 18 and 19 right? I can't see where a PULSE would go in your episode 17 so it would make sense to have two leaders being fought.
That E19 would be too epic. Fighting two PULSE pokemon (Clawitzer and Mr Mime), fighting Sapphira, fighting the E4 and champion then the entire post game where we can catch every legendary! It would take forever but be incredible!