During 2003 NJPW began to phase out most of the Luchadors they had employed over the years and thus Black Tiger began working regularly in Mexico for CMLL, this marked the first time the gimmick was used for a longer period of time outside of NJPW. Since the storyline in Mexico was that Black Tiger was Japanese they could not acknowledge the fact that he and Dr. Wagner Jr. were brothers (in Japan Black Tiger had always been portrayed by a foreigner). He usually ended up as Dr. Wagner Jr.'s back-up but on 31 March 2001, Black Tiger, Dr. Wagner Jr., and Universo 2000 won the CMLL World Trios Championship from Atlantis, Black Warrior, and Mr. Niebla. The team would hold the Trios title for over a year until being unseated on 9 July 2004, by Black Warrior, El Canek, and Rayo de Jalisco Jr. When their father (Dr. Wagner) died on 12 September 2004, Dr. Wagner Jr. was turned "tecnicó" (good guy) by sympathy but since González was working as Black Tiger and not publicly acknowledged as the son of Dr. Wagner he remained a "rudó" (bad guy). Dr. Wagner Jr.'s turn meant that Black Tiger did not have a partner or a direction, he began working for CMLL's associate International Wrestling Revolution Group (IWRG) and some smaller CMLL shows, basically in a holding pattern.