Tyrogue’s evolution is determined by its highest appraisal stat value. It’s very simple:

  • Highest ATK -> Hitmonlee
  • Highest DEF -> Hitmonchan
  • Highest STA -> Hitmontop

In case of stats ties, here’s how it works:

  • Tie of two stats -> 50% chance for each
  • Tie of three stats -> 50% chance for Hitmontop, 25% chance for Hitmonlee and Hitmonchan.

Here’s a handy mobile chart, credits go to PixelPoncho!