The supplemental material to the paper "Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies" provides detailed information on the methods used to measure black hole (BH) masses in active galactic nuclei (AGNs) and the classification criteria for pseudobulges. Section S1 discusses three main methods for estimating BH masses: reverberation mapping, single-epoch spectroscopy, and the X-ray–radio–M$_{\bullet}$ "fundamental plane." Section S2 outlines the criteria used to distinguish between classical and pseudobulges, emphasizing the importance of disk morphology, nuclear bars, Sérsic indices, rotation dominance, and other characteristics. Section S3 addresses corrections needed for 2MASS apparent galaxy magnitudes, particularly for elliptical galaxies with large Sérsic indices, to ensure accurate measurements of bulge magnitudes. Section S4 reproduces the BH database from the main paper, including tables of BH and host-galaxy properties, with detailed notes on individual objects. The material aims to provide a comprehensive understanding of the methods and considerations involved in studying the coevolution of BHs and their host galaxies.The supplemental material to the paper "Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies" provides detailed information on the methods used to measure black hole (BH) masses in active galactic nuclei (AGNs) and the classification criteria for pseudobulges. Section S1 discusses three main methods for estimating BH masses: reverberation mapping, single-epoch spectroscopy, and the X-ray–radio–M$_{\bullet}$ "fundamental plane." Section S2 outlines the criteria used to distinguish between classical and pseudobulges, emphasizing the importance of disk morphology, nuclear bars, Sérsic indices, rotation dominance, and other characteristics. Section S3 addresses corrections needed for 2MASS apparent galaxy magnitudes, particularly for elliptical galaxies with large Sérsic indices, to ensure accurate measurements of bulge magnitudes. Section S4 reproduces the BH database from the main paper, including tables of BH and host-galaxy properties, with detailed notes on individual objects. The material aims to provide a comprehensive understanding of the methods and considerations involved in studying the coevolution of BHs and their host galaxies.