HELP! Stuck in the begining!

So I started the game and I can’t leave the dungeon. I got the Darkrai suit DNA, but it doesn’t appear in my inventory. Can someone help me?

Turn around and talk to your Mew follower.

How does one do this. Everytime i turn around he goes right back behind. I cant figure out how to get the F out of this place.

Please refrain for necro-ing old posts, it has been 9 months since the last reply…