AntoineH on "[Plugin: Football Pool] Email All Users With Score"

Is there is any option to send email to all participants with all participants score before game starts.

https://wordpress.org/plugins/football-pool/

No, the plugin does not contain an email feature.

You'll have to write this yourself. Or find a plugin that can handle this for you. If the mail plugin supports the use of shortcodes, you can add one of my shortcodes in the mail body to automatically show the scores. If not, you can create a page/post in draft that uses this shortcode, preview it in WP and copy/paste the output in the mail.