What determines whether Tyrogue evolves into Hitmonlee, Hitmonchan, or Hitmontop?

Question

I have over 4 Tyrouges and want to evolve them all.

Answer 1

Tyrogue evolves into one of three different Pokémon starting at level 20:

Hitmonlee if its Attack is higher than its Defense.

Hitmonchan if its Defense is higher than its Attack.

Hitmontop if its Attack and Defense are the same.