Hi everyone. I present to you a Pokemon TCG Turn 1 Simulator and Probability Calculator.
It is not a calculator in the sense of the word. It simulates the shuffling/drawing of cards/checking for Mulligan/drawing of prizes and drawing of turn 1 card. It loops it multiple times (up to 15K loops in 1 minute). This gives a very close probability of events happening.
Results range from probability of drawing a card at turn 1 to probability of getting mulligan. It also gives probability of getting certain number of favorable cards at turn 1 by tagging the cards as favorable.
There is an instruction inside the tool under “more information” button.