In the Pokemon Never Ending Story, Drampa could contribute to the plot in multiple ways. It could be a protector. Say there's a group of weaker Pokemon being threatened by a villainous Pokemon or a natural disaster. Drampa steps in with its strength and abilities to save them. This act of heroism could then set off a chain of events that drives the story forward. Also, it could be a guide for a young trainer on a journey, leading them to new and exciting places in the Pokemon world.
Drampa might contribute to the plot by being a source of wisdom. Since it's an older - looking Pokemon, it could have knowledge that helps the main characters. For example, it might know the location of a rare item or how to defeat a powerful enemy.