I was trying to catch Raikou, and I had my Lugia. I was exerting my Pressure and I assumed Raikou was as well. Strangely, when I used Roost it only lost 1 PP instead of 2, which would be the effect of Raikou's Pressure. Unfortunately, when I caught the Raikou it was the wrong Nature and I SRed before checking its Ability. So do Suicune, Raikou and Entei have their HAs in ΩRuby/∂Sapphire? Or does Pressure cancel out if both Pokémon have it?
No. They do not have their Hidden Abilitys Their Hidden Abilities havent been released yet. its mostly gonna be an event for them
Source:Personal Gameplay, and Showdown random noobs 24/7 :p
Edit: When this Pokemon is hit by a move, the opponent's PP lowers by 2 than 1. so roost would only lose 1PP commented 5 Minutes ago by Your Worst Nightmare