Let me know if you have suggestions for how to improve the minigame explanations! Most people understand it better than you did! I'm sorry.
https://gitgud.io/argonvile/monster-mind/-/blob/main/source/TutorialDialog.hx#L1...
Rhydon explains how you move 1-4 spaces depending on the dice, explains how you each choose two dice and set them however you want, and explains how it's all about predicting what your opponent does! And then gives you two practice turns and explains everything that happens. I don't know how to explain it better than that! Maybe it's just hard to explain.