===International Wrestling Revolution Group (2000–2004)===
After returning from his stint in WCW, El Dandy began working for the Naucalpan, State of Mexico-based [[International Wrestling Revolution Group]] (IWRG).<ref name=ElDandyIWRG>{{cite web | url=https://www.cagematch.net//?id=2&nr=908&view=&page=4&gimmick=&year=&promotion=77®ion=&location=&arena=&showtype=&constellationType=&worker= | title=El Dandy >> Matches >> International Wrestling Revolution Group | work=CageMatch | accessdate=May 21, 2020}}</ref> His first IWRG match took place on July 6, 2000, and saw El Dandy, Ciclon Ramirez, [[Kato Kung Lee]], and [[Super Parka]] lose to [[Bombero Infernal]], [[Dr. Cerebro]], [[Mosco de la Merced]], and [[Super Crazy]].<ref name=ElDandyIWRG/> HeOn laterFebruary 8, 2002, he challenged [[Scorpio Jr.]] for the [[IWRG Intercontinental Heavyweight Championship]] but lost the match.<ref name=ElDandyIWRG/> While in IWRG, he defended the Mexican National Light Heavyweight Championship on two occasions, against [[Negro Casas]] on July 24, 2003, and against [[Blue Panther]] on August 31, 2003.<ref name=MexLHReign1>{{cite web | url=https://www.cagematch.net//?id=5&nr=495&page=5&reign=61 | title=Mexican National Light Heavyweight Championship >> 01.09.2002 – 15.10.2004: El Dandy | accessdate=May 21, 2020 | work=CageMatch}}</ref> He was one of eight wrestlers who put his hair on the line in a multi-man ''Lucha de Apuestas'' match; Suicida lost the match and his hair.<ref name=ElDandyIWRG/> On March 18, 2007, El Dandy was involved in a steel cage match where both his light heavyweight championship and the [[IWRG Intercontinental Welterweight Championship]] were on the line. In the end Fantasma de la Ópera defeated Dr. Cerebro to win the IWRG title.<ref name=ElDandyIWRG/> His last match with the group took place a week later, as Damián 666, [[Misterioso Jr.]], and Villano III defeated El Dandy, [[El Sagrado]], and [[Máscara Sagrada]] by disqualification.<ref name=ElDandyIWRG/>