The January loan signing from Manchester United is being selected ahead of centre-forward Ollie Watkins given his current form.
Emery said: "You always need two strikers and being versatile is better. Rashford is versatile. I want to have players like these two as we try to get to the level we want.
"I like to have players in the squad at the level those two have shown us. My job is to share the playing time between both, manage the person as well as the professional, as well as the tactical idea and my selection for each match.
"I want to have the same selection problems I have had in the last matches we have played. Some players will be on the bench but they are very important and they have showed it this season by making an impact. That’s what I want.
"I had more problems when I didn’t have enough players to play at the level I wanted. Now I have enough to compete at this level and we can see the difference between how we are now and how we were six months ago."