I'm using geckoLib, I'd like to add an attack animation to an entity.
 

Spoiler

public class DrevoEntity extends IronGolem implements NeutralMob, IAnimatable {
...
  private <E extends IAnimatable> PlayState predicate (AnimationEvent<E> event){
          if (//Here//){
              event.getController().setAnimation(new AnimationBuilder().addAnimation("animation.drevo.attack"));
              return PlayState.CONTINUE;
          }
          if(event.isMoving()){
              event.getController().setAnimation(new AnimationBuilder().addAnimation("animation.drevo.walk"));
              return PlayState.CONTINUE;
          }
          return PlayState.CONTINUE;
    }
...

 

 

The IronGolem#doHurtTarget methods associated with the entity fire when it attacks, but I'm not sure if I can use it somehow?

I don't know why you keep asking geckolib questions here?

These are the forge support forums.

You should ask wherever geckolib provides support or I believe there is a third party modding channel on forge's discord.