I would use a different strategy for Physical Togekiss.
Give it Hustle, that gives you an Attack boost, at the cost of some accuracy. Or you can use Work-up and Serene-grace.
Give it Extreme-speed, Drain-punch, Zen-headbutt/Aerial-ace, and Work-up/Roost/Thunder-wave
Roost or Thunder-wave if you go with Hustle. I would do Zen-Headbutt over Aerial-ace with Serene-grace for Flinch chance, and Aerial-ace for Hustle because of the perfect Acc.
Sweeper EVs, Life-orb with Hustle, Leftovers with Work-up+Serene-grace.