First question: is this the lunatic map? Second question: Why are you trying to bait Michalis? A lot of the strategies I've seen try to bait the lance flyer to kill her and cut some of the buffs Michalis gains from the two flyers with Goad Flyers. I think both have them. Well, both of them have Drag Back which causes problems like trying to trying to one round the lance flyer only to get your unit dragged back to Michalis and his goons.
One strategy that was suggested was one using F!Corrin, Frederick, Olivia, and adult Tiki. Corrin basically acts as a meat shield to bait the lance flyer and to kill the sword cavalier after Olivia uses Dance on her to let Corrin go all the way next to wall so the lance flyer cannot drag her back. I'm guessing you don't have a Frederick, but do you have a Gunter?
There is another strategy using Abel, Stahl, or Sully to rush in and kill the sword cavalier to bait the lance flyer. I don't know what happens next other than the lance flyer is probably kept busy or killed by an axe unit and a red mage or dragon goes after Michalis. Also, there is a strategy to use Nino to nuke the hell out of the lance flyer and using her and a dancer to Draw Back and retreat forcing Michalis's units to go after you since one of their allies just inexplicably exploded. You might be able to use
@Benishigure's strategy since you have Jeorge who could kill the Pegasus Knights.
Basically, the main problems of this map are Michalis because of how strong he is and physically durable and the lance flyer dragging people back to Michalis.
If you want, I could ask in the Serenes Forest thread for you since everyone has their own specific units and issues with this map. Might be helpful to provide levels on your units.