Seeing as the Scipii have no War Elephants, and mercenary war elephants are incredibly rare, he has to use more traditional methods of warfare.

I wouldn't worry too much about the Egyptians. As long as you keep a balanced force in Africa to deal with them, you should be able to beat them like any other faction. Their chariots can be troublesome, so counter them with archers. They also like their own archers, which if they badly outnumber your own should be a high priority to kill.

If you are going up against the Egyptians you should probably make them your priority. Ignore other factions and conquests. So once the rest of North Africa is Scipii blue, move into Egypt and take their triad of important settlements as soon as you can - Memphis, Alexandria and Thebes (I think that's the 3). They are hard to control because of the incredible growth rate there, but they are rich and will provide training grounds for more legionaries etc with which to defeat the rest of the Egyptian force. It'll be a bit of a chore at first, but you'll soon find your rhythm and perfect army to beat the Egyptians.