Set Y

var config = {
    type: Phaser.AUTO,
    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.spritesheet('diamonds', 'assets/sprites/diamonds32x24x5.png', { frameWidth: 32, frameHeight: 24 });
}

function create ()
{
    //  Create 5 sprites in our group (one per frame)

    //  Use the setXY object to set the positions on them all to be 100 x 100 + 64px Y spacing (the stepY value)

    var group = this.add.group({
        key: 'diamonds',
        frame: [0, 1, 2, 3, 4],
        setXY:
        {
            x: 100,
            y: 100,
            stepY: 64
        }
    });
}