Actually, PSSE still works with the latest update (1.2.17), plus through the new Ironhax installer for 10.1.0.27 system version. But I agree with
@pokemonshuffler12345 - "thanks" to these stupid people using unreleased Pokémon at online competitions, surely Nintendo will enforce actions to break all the Homebrew use through a new system update, soon.
If you want to compete, despite having access to everything through PSSE,
don't aim for high scores; leave them and the prizes for the people that doesn't want to use PSSE.
Also, don't use unreleased Pokémon. It's more fair this way.
At least, the Ditto users on NA and Japan leaderboards were "banned" to the last positions. I'm aiming for a lower score on purpose since the beginning of the Charizard Y competition, and suddenly at last night, I was bumped 56 positions above - at the same time the insane scores were removed from the first positions.