I've been playing some showdown so I don't know if it's with that or not but does pressure affect opponent moves like light screen, roost, or the such?
When another Pokémon uses a move targeting a Pokémon that has Pressure, when PP is deducted from that move, one more PP than usual is deducted.
So only moves that affect the Pokemon with Pressure.
Pressure (Bulbapedia)
Hope I helped!
Pressure applies to all moves targeted at the ability bearer or that target the whole battle field, though it doesn't work if an ally is directly targeting the ability bearer.
Hope this helps! :)
Yes, it is only moves used against the ability bearer, even if it misses. source