Welcome to yet another story of Myotismon's return. As there are no doubt plenty of these stories around, I'm just going to say that I hope that this story will offer something a bit different. Before I begin, I'm going to bring in the disclaimer, author's note, and (most importantly) an explanation of this alternate history.
Disclaimer: I don't own Digimon and never will. I'm writing this story just for the heck of it, so don't sue me.
Author's Note: I don't doubt that many fans will read this and say to themselves, "Now that is truly messed up." Or, "That shouldn't happen that way!" However, I've never seen any of the movies and this is an alternate history which means that it is going to diverge from the show. I've seen many of the eps and read the spoilers, so I know how things end up on the series. Since this is different, though, it won't end like the series. Also, I'm just going to work on this story whenever I get inspired to write, so I may go a while between parts.
Alternate History Lesson #1: The hard part with this is figuring out exactly where to start. Let me see... First off, if I remember right, in the battle with Apocalymon (or however it's spelled) I remember a mention of previous Digidestined. This story takes place during the 02 Season, but these Digidestined forerunners are still around, one of whom was Myotismon's human partner.
Myotismon, himself, became evil when he was infected with a virus (The Beast Within or as I like to call it, the Crotch Critter) during a battle. Not wanting to destroy Myotismon, he was put into a kind of stasis by Gennai and his crew until Devimon showed up and upset the balance of the Digital World.
Since we all know what happened with Devimon, Myotimson, the search for the 8th child, and then the Dark Masters, I'll fast forward ahead to the 02 Season. I'll just say that instead of infecting Oikawa, Myotismon's data was sent back to the Digital World and entrapped in a digi-egg.
The Destiny Stones are still around, and they do hold Azulongmon, but only because Azulongmon is using his power to hold in check the powers of Darkness. Every now and then, the Darkness leaked through to cause trouble, therefore the Digidestined were needed to make things right again. Fortunately, Azulongmon's power kept the Darkness synched with real world time so that the Digital World could enjoy thousands of years of peace instead of just a few (until Digital World time evened out with real world time, of course).
When the Darkness failed to when its freedom and gain control of the Digital World through Digimon agents, it changed tactics attacked through one of the Digidestined. Arukenimon and Mummymon were created by the Darkness to implement its will. Though Ken is no longer under the control of the Darkness, the Darkness still strives to win its freedom from Azulongmon.
That's all for this alternate history lesson. Hopefully that will answer all the questions for now, but feel free to ask questions so I'll know whether or not it's necessary to put up more history lessons as I go along.