The Pokémon Winds and Waves games don't release for another year, and that means a ton of people are looking for any information they can get before Nintendo announces it. A new pokémon attack has been discovered in a leaked set of game data on the Nintendo website.
The new attack is called 'SQL Injection'. The attack attempts to hack the game itself by modifying miscellaneous data, like the player's name, in an attempt to change the internal database. The affect usually damages the target pokémon, but can also have other affects like changing it's state to stunned or asleep, or puts the pokémon back into the trainer's pokéball. Based on the leaked data, it's believed this is a very dangerous attack because it can also affect the player's pokémon too. Either positively adding health, or reducing it.
Porygon2 learns it at level 50, or any Normal type pokémon can learn it from a TM.