Delarmino would later take up
Muay Thai and would be known under the moniker "The Destroyer". He and his sibling would frequent a gymnasium. Due to lack of funds to pay an instructor to teach them, he and his sibling would just watch sessions and would just imitate what they observed. They would join competitions at the local fiesta. His career took off, when he won a national championship at age 16. He became part of the Philippine national team in 2012. His first stint in the
Southeast Asian (SEA) Games was in the
2013 edition where he finished as a silver medalist. Muay Thai would return to the SEA Games in the
2017 edition. Delarmino joined but was only able to reach the quarterfinals of his event. Delarmino would earn a bronze medal at the
2018 IFMA World Muaythai Championships Mexico in a Competitive B event. However, he just ended fifth place in the succeeding
2019 edition held in Thailand. He would return again for the SEA Games in the
2019 edition, his third time. He would win his first-ever SEA Games gold medal in the tournament hosted at home. This is his first-ever world title. In the
2021 SEA Games, which was postponed to 2022 due to the COVID-19 pandemic, Delarmino settled for silver after his opponent Nguyễn Doãn Long was judged to be the winner in the highly disputed match. He would file a successful protest and he was ruled to be the winner after a review. He would compete in the 2021 World Games in
Birmingham after qualifying through his feat in the Muaythai Championships. He would be the first-ever Filipino to be nominated for the 2021 World Games Athletic of the Year, an honor that would be bestowed to India's
P. R. Sreejesh. Delarmino would compete again in the
Southeast Asian Games' 2023 edition in
Cambodia, this time in
kun bokator. He settled for bronze in the men's combat 60 kg category. ==Personal life==