So, i want that i can hurt my entity, but at the same time is like it doesnt have any collisions(like a ghost that i can't trespass it)

The method "isPushable" is not working when im returning false and im overriding it, so for fixing that(make that i cant push it when i hit my entity) i did this:

@Override
	public void knockback(double p_147241_, double p_147242_, double p_147243_) {
		super.knockback(0,0,0);
	}

 

And the only thing remaining as i said, make that i can't pass through my entity

I thought that the method "canBeCollidedWith" could work but that doesnt let me hurt my entity, so i need another method to do it

To make this work I think you only need to override the push method. That way the entity will still push away other entities, but itself remain still. Although you might still have to override the knockback method so it does not move when it is attacked. I think the Shulker is a good example to look at in this case 🙂