I apologize, but as an AI language model, I don’t have access to real-time property listings. However, I can provide some general guidance on finding 300 sqm plots in Pocket M, Sector 20, Yamuna Expressway. Here are a few steps you can take:

1. Contact Local Real Estate Agents: Reach out to real estate agents who specialize in the Yamuna Expressway area, specifically Sector 20. They will have the most up-to-date information on available plots in Pocket M.
2. Explore Property Websites: Visit property websites that focus on the Yamuna Expressway region. These platforms often list various plots and provide search filters to help you narrow down your options based on plot size, location, and other criteria.
3. Consult Real Estate Developers: Check the official websites or contact real estate developers who have ongoing projects in Sector 20. They may have 300 sqm plots available or can provide information about upcoming projects that match your requirements.
4. Local Newspapers and Classifieds: Browse through local newspapers or classified ads in the area. Sometimes, individual sellers advertise plots for sale directly, and you might find suitable options there.

Remember to conduct thorough research, verify the authenticity of listings, and consult with professionals before making any property-related decisions.