Conversion can turn you into normal type.
magic Coat seems to reflect back A LOT more, it reflected back screech and smoke screen, so it'll take me a few days to test everything.
magic coat only also blocks the first effect in a double battle: glameow used hypnosis, stunky used smoke screen, hypnosis was reflected back, smoke screen wasn't.
Something that might help you:
http://veekun.com/dex/moves/screech
There's a flag for Magic Coat, and Screech and SmokeScreen have the flag on. You should be able to just check whatever moves you want and manually verify if you feel like it.
Anyway, I've done some testing on my on, and hopefully this should settle any remaining questions about Pressur
e.
Partner Dusclops, Pressure.
Ludicolo's Rain Dance loses 2 PP, due to ally's pressure.
Ludicolo's Ice Beam loses 2 PP when targeting ally.
Ludicolo's Surf loses 2 PP when targeting everyone else including ally.
Dusclops uses Protect, it only loses 1 PP.
Something uses Acupressure on Dusclops, and only loses 1 PP.
Vileplume uses Lucky Chant on allies and only loses 1 PP.
Vileplume uses Aromatherapy on allies and the team (including another Pressure pokemon) and still only loses 1 PP.
Vileplume uses Giga Drain on Dusclops. Dusclops protected itself, but Vileplume still lost 2 PP.
Conclusion: Pressure makes any move with target type "enemy", "enemies" (didn't test but assume), "others", or "all", that includes the Pressure pokemon in the targeted pokemon, will lose 2 PP.
Remaining questions:
1. What happens if you target two or more pokemon with Pressure? Ludicolo using surf, with a Pressure partner, and two Pressure enemies. Would it lose 4 PP?
Obi+ says yes.
2. What happens if you attack a Pressure pokemon but miss? Do you still lose 2 PP?
Yes, tested this.
3. What happens if the Pressure pokemon ITSELF uses an "all" target type move? (examples are Haze, Rain Dance, Trick Room, etc.)
It doesn't count itself when considering Pressure. If you have two Pressure pokemon, and one of them uses Trick Room, it will take 2 PP because of its teammate.