This is a forum for the Hollywood park so you're in the right place. There is no transfer for Despicable Me. You literally just roll up to the wheelchair spot in the theater and enjoy 3D movie. It was a recent addition from my understanding but my mom has a bad back (9 back surgeries) and she was able to enjoy the ride in the little wheelchair booth. You need to ask the employee at the front of the ride for accommodations.
For transformers and Harry Potter you may be out of luck as they have a lot of movement. I personally wouldn't risk it. Transformers is bumpy so i'd avoid that. Forbidden Journey is smooth but it really tosses you around, sometimes you're facing straight up, other times straight down.