It can be very good in-game for sure.
In-game I would suggest a different set to a competitive one.
Togekiss @ Leftovers
Trait: Serene Grace
EVs: 252 HP / 252 SAtk / 4 Spe
Modest Nature
- Air Slash
- Aura Sphere
- Shadow Ball/Roost
- Thunder Wave
Ok not so different from Competitive set. I would say in-game you can go for Shadow Ball simply for coverage. EVs are included even if you dont do EV training. Good luck and have fun.