DSVS

He says that the Ana contract is not available yet or something. Idk if its refering to this current version or like its not available yet in my story progress

So I discovered the ana code later on and I would like to play as her but when I try to input the code on the pc it says that I cant do it anymore. Is there any way to play as her without having to start over? (im only on chapter 2 so I guess starting over wouldnt be a huge issue but I've been catching every pokemon and it would be a bit of a chore to do that all over again)