Serene Grace

[Broccili_ Boy]

Serene Grace says" Once during your turn when you play togekiss from your hand to evolve one of your pokemon you may use this power"

I assume you can use it after you play it like Evolve to togekiss the use a supporter like steven's advice and then use Serene Grace.

 

[PokePop]

No. If you're going to use it, you have to use it right away.
If you take some other action like playing a supporter before using it, you have forfeited your choice to use it!