This pokemon can definately put some hurt on your standard team.

Salamence, Heracross, Zapdos, and Celebi don't like the moveset this thing gets.

Pros:
+ Fast
+ Lovely Kiss
+ Nice Sp.Atk
+ Can do some serious damage to Standard teams who aren't prepared for Jynx.

Cons:
- No defenses
- Although it can wreck a standard team, it is walled hard by the Sp.Def walls.
- Kinda relies on the Lovely Kiss for set-up.

Sets:
These are the two I've used.

Jynx (F) @ Leftovers
Trait: Oblivious
EVs: 132 HP / 252 Spd / 124 SAtk
Timid Nature (+Spd, -Atk)
- Calm Mind
- Ice Beam
- Lovely Kiss
- Psychic

Basic and Standard. You can add sub in there if you wanted. You sleep something that would be a pain, CM then start blasting...until walled.

Jynx (F) @ Leftovers
Trait: Oblivious
EVs: 132 HP / 252 Spd / 124 SAtk
Timid Nature (+Spd, -Atk)
- Ice Beam
- Psychic
- Fake Tears
- Lovely Kiss

I used this on a Spikes Team along with Charm Breloom. It forces Switches. You sleep then start Fake Tears. They will either allow the thing to get KO'd or switch..spikes, ftw.

Overall:
Not a bad pokemon. Other powerhouses out speed it but the STAB Ice Beam/Psychic can put some hurt on those standard sweepers. Just predict well and know when Jynx isn't going to be able to KO something because Jynx can't take a hit.

Jynx is my favorite pokemon, and an awesome special sweeper. Frankly, if she sets up, she can kill most teams if Snorlax/Blissey is out of the way.

If you can abuse Lovely Kiss on either, you can CM enough to do massive damage to them even with that sp.def and HP

Wow, never knew that jynx was so good.............
I personally don't like them, but mayve on my next netbattle team I'll try

Needs more Sleep Perish Song Jynx.

Is that the LK, ML, PS, IB/Psy set?