Thanks a bunch! I managed to make Sudowoodo lay Budew eggs if it has a Spring Birthsign, Cacnea eggs if it has a Summer Birthsign, Bonsly eggs if it has an Autumn Birthsign, and Snover eggs if it has a Winter Birthsign!
Also, I hope you don't mind, but I'm using your Trainer Birthsigns, Pokemon Birthsigns, and Birthsigns Journal scripts for my game, which is currently in progress.