(Wattson returns his Pokemon and they return to the gym. The scene of New Mauville changes a new scene. We see Wattson’s assistant attaching some medical equipment to Elekid. Elekid is still in bad shape, but it looks at Max, and it seems that it wants to say something to him.)
I think the "The scene of New Mauville changes to a new scene." is really unnecessary. The first sentence already says that they returned to the gym.
That was really the only grammar error I could find.
But I think your chapters are getting a bit too predictable. It always sticks to what the characters say is going to happen, and it was quite obvious that Elekid would join Max. Try making something abnormal happen, such as introducing one of the Hoenn Legendary Pokemon and making it go on a rampage or something.
But good job!
Anger the Blaziken, and you get BURNED
Example of the above:
YOU: Hey Blaziken, your ugly!
BLAZIKEN: .......JO FACE!(burnnned)