Adam, the 8th Gym Leader, is missing?!

I have completed the storyline up to the 8th gym the dream realm. I have even gone back through 20 plus times, battled all trainers, collected all available items and even caught darkrai, but Adam is not inside the gym and i have no idea what to do. Can someone please direct me in the right way as to what to do or if it’s a bug of some sort?.

he went to buy some milk


no one cares about this dude’s problem or they just cant solve it and i just got 3 hearts for my pretty terrible joke