Are you sure the controversy was with Catholics? Wikipedia is notorious for spawning multiple pages on the same topic, but the first link I when googled
was this: en.wikipedia.org/wiki/Pokemon
In the controversies section, it says:
Pokémon has been criticized by some Christians, Jews, and Muslims. Christian concerns over Pokémon have primarily addressed perceived occult and violent themes as well as the concept of “Pokémon evolution” (which some relate to the theory of evolution), which is said to go against the Biblical creation account in Genesis, which the majority of Japanese, not adhering to Christianity, do not believe in.  The Vatican, however, has countered that the Pokémon trading card game and video games are “full of inventive imagination” and have no “harmful moral side effects”
I wonder if you aren’t confusing Catholics with other Christians?