Upon his return to Spain in 1893 Tamarit was nominated the movement leader for the province of Tarragona.
At this post he contributed to transformation of Carlism into a modern structured organization, engineered by the national Jefe marqués de Cerralbo.
Dubbed “l’home fort”, Suelevs threw himself into organizing local network, resulting in Tarragona province boasting more circulos and juntas than Navarre.
In 1896-1897 he participated in preparatory works to Acta de Loredan.
Scale of his contribution is unclear; the document cautiously endorsed papal social teachings, while Suelves nurtured definitely ultraconservative and reactionary views.
As a politician perfectly well accommodated within the Restoration system and close collaborator of the non-belligerent Cerralbo, he voiced against violence during the La Octubrada crisis, though he probably formed part of a clandestine Tarragona junta collecting funds and arms for a would-be coup.
He was spared any governmental repression afterwards.

In the first decade of the 20th century Tamarit emerged as one of the national Carlist leaders, though formally he headed the provincial Tarragona organization only, subordinated to the regional Catalan jefe.
In 1901-1903, when poor health threatened leadership of the national Carlist leader Matías Barrio y Mier, Carlos VII intended to relieve the latter of some duties by creating an auxiliary Junta Central; Tamarit was nominated its member representing Catalonia and Aragon before the body was dissolved shortly afterwards.
During the Ley de Jurisdicciones crisis Suelves advocated entering the Solidaritat Catalana alliance with Republicans and Nationalists in 1907, though his stance resulted from shrewd analysis of decreasing Traditionalist strength in the province and his natural penchant for alliances rather than from sympathy for Catalanism.
Tamarit was always keen to defend traditional regional establishments, but voiced decisively against the Catalan nationalism.

 
When Juan Vázquez de Mella emerged as the leading Carlist theorist and most dynamic politician, former marques de Tamarit appreciated his intellectual and rhetorical skills, though he was skeptical as to his leadership potential and remained perplexed by him apparently sidetracking the official party leader Bartolome Feliu Perez and the new claimant, Don Jaime.
 On the other hand, some sources suggest that in 1911 Tamarit conspired against Feliu, though not as part of the unfolding Mellista plot, but out of his support for Cerralbo.
During the mounting conflict between Mella and Don Jaime Suelves sided with the pretender.
In 1917 he was entrusted with reorganization of the Tarragona branch, handing over shortly to Victor Olesa Fonollosa, former member of the local Diputació Tarrgona.
In 1919, when most Catalan Carlist leaders joined the breakaway Mellistas, Suelves/Montserrat remained loyal to Don Jaime.
During the Primo de Rivera dictatorship he did not hold any official positions, limiting himself to propaganda activities like gatherings of the ever-smaller group of combatants of the Third Carlist War.
Upon his return to Spain in 1893 Tamarit was nominated the movement leader for the province of Tarragona. At this post he contributed to transformation of Carlism into a modern structured organization, engineered by the national Jefe marqués de Cerralbo. Dubbed “l’home fort”, Suelevs threw himself into organizing local network, resulting in Tarragona province boasting more circulos and juntas than Navarre. In 1896-1897 he participated in preparatory works to Acta de Loredan. Scale of his contribution is unclear; the document cautiously endorsed papal social teachings, while Suelves nurtured definitely ultraconservative and reactionary views. As a politician perfectly well accommodated within the Restoration system and close collaborator of the non-belligerent Cerralbo, he voiced against violence during the La Octubrada crisis, though he probably formed part of a clandestine Tarragona junta collecting funds and arms for a would-be coup. He was spared any governmental repression afterwards.
In the first decade of the 20th century Tamarit emerged as one of the national Carlist leaders, though formally he headed the provincial Tarragona organization only, subordinated to the regional Catalan jefe. In 1901-1903, when poor health threatened leadership of the national Carlist leader Matías Barrio y Mier, Carlos VII intended to relieve the latter of some duties by creating an auxiliary Junta Central; Tamarit was nominated its member representing Catalonia and Aragon before the body was dissolved shortly afterwards. During the Ley de Jurisdicciones crisis Suelves advocated entering the Solidaritat Catalana alliance with Republicans and Nationalists in 1907, though his stance resulted from shrewd analysis of decreasing Traditionalist strength in the province and his natural penchant for alliances rather than from sympathy for Catalanism. Tamarit was always keen to defend traditional regional establishments, but voiced decisively against the Catalan nationalism.
 
When Juan Vázquez de Mella emerged as the leading Carlist theorist and most dynamic politician, former marques de Tamarit appreciated his intellectual and rhetorical skills, though he was skeptical as to his leadership potential and remained perplexed by him apparently sidetracking the official party leader Bartolome Feliu Perez and the new claimant, Don Jaime.  On the other hand, some sources suggest that in 1911 Tamarit conspired against Feliu, though not as part of the unfolding Mellista plot, but out of his support for Cerralbo. During the mounting conflict between Mella and Don Jaime Suelves sided with the pretender. In 1917 he was entrusted with reorganization of the Tarragona branch, handing over shortly to Victor Olesa Fonollosa, former member of the local Diputació Tarrgona. In 1919, when most Catalan Carlist leaders joined the breakaway Mellistas, Suelves/Montserrat remained loyal to Don Jaime. During the Primo de Rivera dictatorship he did not hold any official positions, limiting himself to propaganda activities like gatherings of the ever-smaller group of combatants of the Third Carlist War.
Josep de Suelves i de Montagut