MY AWESOME TEAM:

Seel (Basic, Water)
Magikarp (Basic, Water)
Psyduck (Basic, Water)

Seel vs. Cubone
Both basic, but Seel is Water and therefore super-effective. WIN.

Psyduck vs. Geodude
Both basic, but Psyduck is Water and therefore super-effective. WIN.

Magikarp vs. Onix
Magikarp is Water and therefore super-effective, but Onix is final so Magikarp loses (I think). =( LOSE.

Two wins and a loss. Oh well! I still win!