At the time in the early 1970s, European riders still dominated the sport of motocross and Americans weren't considered as talented due to their relative lack of experience. Pomeroy arrived in Europe as an unknown and then proceeded to shock the motorcycle world by riding his privateer Bultaco to an upset victory in the 1973 250cc Spanish motocross Grand Prix. The news of his unexpected victory created a huge wave of excitement in the American motorcycle community where motocross was undergoing an explosive growth in popularity. His victory signaled that American motocross riders were ready to compete with the best in the world. The Bultaco factory quickly hired him to remain in Europe to compete in the 250cc motocross world championship. Pomeroy was once again named to the American team for the 1973 Motocross des Nations event where he helped the team improve to a fourth place result.