The best picks globally to counter Pyke include Kalista, Jinx, and Aphelios. These are all great at countering Pyke with decent win rates over 55%. Even if these Pyke counter picks are not used in the same position as you, it's not smart to choose him into these matchups. They will most often win against Pyke.
Conversely, if the enemy team picks either Ivern or Kennen, you should strongly think about taking him, as he easily beats these champions with win rates over 53% against each ofthem.