For Dark Boo: Use Slow Shroom (I don't know if this overrides the Reverse Mushroom from Yoshiman222) Roll an 8 to Miracle Space. If it doesn't work, then Control Shop to make Parasol Space I will land on into a Miracle Space.
For H-J: Use True Tea on Dark Boo, then use Magic Lamp to the Star Space, then land on Bowser Space.
For H-J: Use True Tea on Dark Boo, then use Magic Lamp to the Star Space, then land on Bowser Space.