Team:
Spearow (Basic, Normal/Flying type)
Gengar (Final, Ghost/Poison type)
Venusaur (Final, Grass/Poison type)
Butterfree (Final, Bug/Flying type)

Battles:
v
I win (super-effective)

v
I win (evolved)

v
I win (super-effective)

v
I win (super-effective)

4-0 win so I get a Mega Stone (assuming I didn't mess up)