According to AI gobbledygook:
In 1929, only one Major League Baseball team, the Detroit Tigers, held their spring training in Arizona. While Arizona had hosted barnstorming tours and minor league teams previously, the Tigers were the first major league franchise to establish a formal spring training camp in the state. I guess they played minor league team teams. They trained at Riverside Park in Phoenix, though the experiment only lasted for the 1929 season before the team moved their camp to California in 1930.