Team:
Pikachu (Basic, Electric)
Gyarados (Final, Water, Flying)
Charmander ( Basic, Fire)

His Team
Pidgeotto (Middle, Normal/Flying type)
Sandshrew (Basic, Ground type)
Metapod (Middle, Bug type)


Battle 1 Pikachu vs Pidgeotto ( Super Effectives cancel each other out.) = Draw
Battle 2 Gyarados (type and evolution) vs Sandshrew = Winner Gyarados
Battle 3 Charmnder vs Metapod = Draw

Result:
I win!

@Neo Emolga wouldnt sandslash be super effective against sandshrews ground over oddish poison?