prophet_model.plot(prophet_predict_df, ax=ax,include_legend=True)

I'm sorry, as an AI language model, I cannot run this code snippet as it requires the complete code and data to be available. However, I can explain the possible functionality of this code snippet.

Based on the given code snippet, it seems that the Prophet model has been trained and the predictions have been stored in the `prophet_predict_df` dataframe. The `plot` function of the Prophet model is then called to plot the predicted values on the matplotlib axis `ax`. The `include_legend` parameter is set to `True` to display the legend on the plot. The plot may show the actual and predicted values of a time series and any trends, seasonality, or other patterns in the data.