To best breakdown why this decision was made, let us refer to TPCis post on the official Pokmon site, wherein four main reasons are given for the ban, and break them down one by one
Cyclizar became a huge hit in the Pokmon Scarlet and Violet video games where it was introduced, because of the fun ability to see it used as a motorcycle for characters in the game
Official Card Game was more positive, fueled in part by the growing popularity of the franchise more broadly but also thanks to the strong reception of the game from fans due to its replayability
Some collectors use a mixed approach: for example, open a few packs for fun and to jump-start a collection, but purchase singles for specific high-value cards or to finish off a set
Two of the best mechanics lead to some pretty lovely cards from the era
Let me know if youre also here for Shiny Lechonk in the comments below!