It gets taming progress by damaging aggressive / hostile creatures. Trap the Amargasaurus, then lure preferably a Daeodon to attack it after you have synced ten. Have a snow owl ready to heal both the Daeodon and the Amargasaurus after shooting the pig for a bit (don’t kill the aggressive creature). This process takes about 45 minutes for a 150 and is an easy way to perfect tame them.