Because this last movie a saw, i think it was Jirachi Wish Maker, I saw Porygon in it and I'm really confused... 0_0''
It was actually an individual episode that got banned, that was featuring Porygon.
Title " Electric soldier Porygon ".
No, a Porygon episode was banned and it was called "Electric Solider Porygon" for causing seizures to kids all over Japan, but Porygon itself wasn't banned, nor its evolutions...
A link is on this page: http://pokemondb.net/pokebase/61872/what-are-all-the-banned-pokemon-episodes
Hope This Helped!