Why no peace lol?
 
Both Torterra and Empoleon are great pokémon,though at start youl have a hard time with Piplup.

When they both evolve to their 2nd stage,they are......for me like brothers that are there to cover eachother.

And the same in my opinion happens on the final stage.This two pokémons are  team builders,they drastically affect your team choices and each of them have weaknesses and strengths.