If you play PvP you can pair the Diplo with a parasaur and make it easy to find enemy reapers/basilisk/purlovia, just use the parasaur to detect where it is and then have a Diplo attack it and it will push it out of the ground and kill it
Good tanks for raids! Use as a frontline attack in front of Brontos or Gigas etc, can push tames back when attacking so you can use this for defence too. Their high speed allows you to run from turrets when on low health. Worth it when passive tamed as the low kib needed means you can tame more.