From the example of Mewat, we can infer that movements take up issues which have been ignored by political parties. Political parties may then be influenced by these demands when they frame their own manifestoes. Finally, the party which comes to power ends up implementing steps which fulfil these demands.
The six-year long Assam movement (1979-1985), led by the All Assam Students Union (AASU), was aimed against the infiltration of foreigners from Bangladesh into Assam. At the end of this movement, the State Assembly was dissolved, the government was dismissed, and fresh elections were held. The Asom Gana Parishad, formed out of the AASU, contested and won the elections, forming the Government of Assam. In this example, we see a political party being formed out of a pressure group, which then goes on to form the government.