one gym per update would be optimal.The next update will take a bit of time because of how big it's going to be, I'll try to keep people informed about the progress. As of right now, I have 3 more pokemon planned, the 2nd gym leader, the big fight with a scene, the moms content as well. If people want I can break it up into a few smaller updates, But I really want to show people I'm putting my best foot forward.
the gen 3 games arent exactly big and theres surprisingly little content between gym battles untill after the 6th when the evil team plot line realy kicks in.
so cutting updates into smaller chunks could make them feel lacking in content.
as for time frames it depends on how much side content and extra battles you plan to implement.
shouldnt be too big of a deal if you drop a post when a bigger update is planned and you take a month extra or so.