Stagger

var config = {
    type: Phaser.WEBGL,
    width: 800,
    height: 600,
    backgroundColor: '#2d2d2d',
    parent: 'phaser-example',
    scene: {
        preload: preload,
        create: create
    }
};

var game = new Phaser.Game(config);

function preload ()
{
        this.load.setBaseURL('https://cdn.phaserfiles.com/v355');
    this.load.image('block', 'assets/sprites/block.png');
}

function create ()
{
    var image1 = this.add.image(100, 100, 'block');
    var image2 = this.add.image(100, 200, 'block');
    var image3 = this.add.image(100, 300, 'block');
    var image4 = this.add.image(100, 400, 'block');
    var image5 = this.add.image(100, 500, 'block');

    this.tweens.add({
        targets: [ image1, image2, image3, image4, image5 ],
        x: 700,
        yoyo: true,
        duration: 2000,
        ease: 'Sine.easeInOut',
        repeat: -1,
        delay: function (target, targetKey, value, targetIndex, totalTargets, tween) {
            return targetIndex * 100;
        }
    });
}