The oracle at delphi is said to prophecy on behalf of which ancient greek god

I believe the correct answer is Apollo.

The Oracle at Delphi (also known as Pythia, the highest priestess) is said to prophecy and consulted about important decisions on behalf of the god Apollo. According to the myths, Pythia was the site of an important oracle in the pre-classical Greek world, when it served as the major site during classical times for the worship of the god Apollo.