I'll try this i guess
Item: Focus Sash
Ability: Flash Fire
Nature: Calm
EVs: Spd 208, Spe 144, Spa 156
Protect
Psychic
Shadow Ball
Overheat
Here is how it goes.
Switch in to litwick while koffing is in.
Koffing uses fire blast and litwick eats that up with flash fire
Litwick will outspeed and...