I have a Togetic at level 28 and it knows:metronome, yawn, wish and sweet kiss So what level should I evolve my Togetic into Togekiss with the shiny stone?
Since Togekiss learns no moves by level up, you can wait until Level 99 if you wanted to.
Being realistic, Togetic's last level up move is at 53 (After You), and for me, I would wait until 41 when it learns Baton Pass.
Togetic's moveset