Basically, Michiko was a researcher and scientist from the TCG islands (An exclusive region to the card game video games believe it or not) and her backstory is that she fled to various regions, namely Unova (very briefly) and more recently Kanto after evading the authorities. A small group of remnants from Team Snagem came to the TCG islands to revitalise their campaign after being beaten in Oree by the two protagonists in those games. As you saw in the RP, only around two followed her to Kanto. I'm not sure what they were planning, probably nothing global, more like some localised Saffron City crimes that would have distracted the authorities from Michiko's plans, which are more grand-scale I think. Michiko has her hands tied controlling her Pokemon though and, as you saw, she spent a long time trying to get her Alakazam, Mahou, to teleport her out of Saffron, which she finally did.
Regarding her, I will probably have her deviate away from her past, but if you want to plan something with the remnants of Team Snagem, I'm all ears. As i've said, there are currently two unnamed Snagem grunts in Saffron, who have been imprisoned by the Kanto authorities, one wearing a blue postman outfit and the other wearing a black rocket-type jacket. The remaining members are probably scattered across the TCG islands OR Orre, if you want to explore those.
I'm down for coordinating something! It would be a good chance to flesh out Michiko's backstory and the characters of those grunts she interacted with. Clearly at least two of them were still loyal so maybe they can have an arc of trying to find out where the scientist is?