This dataset provides supplementary fitting results for temperature dependent magnetic susceptibility of powder MAX phase samples with composition (V0.2Cr0.8)2Ga1-yGeyC across multiple Ge contents. It includes two full model sets for each sample: one with an FM impurity term and one without it. For every sample and model combination, the dataset contains fit parameters, fit quality metrics, summary tables, and report figures to support comparison of model performance and interpretation of magnetic behavior.