What are the skills needed to become an architect?

Math! Especially geometry.

Art classes to learn basics in designs and drawing techniques.

Engineering classes could also help to learn what's feasible with a design. Some design ideas are great, but might not be possible. Engineering can help you learn this.

If this is offered, graphic design. A lot of architects now a days use software to help them. Taking a graphic design course can help you better familiarize yourself with this kind of software.