Gen 8 BDSP NU
Jynx (F) @ Leftovers / Never-Melt Ice
Ability: Dry Skin
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Ice Beam
- Psychic
- Substitute / Lovely Kiss / Focus Blast
- Nasty Plot / Lovely Kiss
This set is mainly a Substitute + Nasty Plot / Lovely Kiss one, but can serve as a Nasty Plot + 3 Attacks set as well. Ice Beam and Psychic are powerful STAB moves that most of the tier don't enjoy switching into since not many Pokemon resist Jynx's STAB moves. Substitute lets you take advantage of the switches you force. Nasty Plot boosts your Special Attack so you can do more damage to opposing Pokemon. Lovely Kiss can be used either with Substitute or Nasty Plot, as Lovely Kiss is useful for putting one of your checks to sleep. Focus Blast is an option if you choose Nasty Plot as the 4th moveslot if you want to hit Wormadam-Trash for neutral damage. Leftovers is used on Substitute variants for HP recovery. Never-Melt Ice can be used on Lovely Kiss + Nasty Plot variants to give Ice Beam a little more power.
Since the set has a few variants, I'll summarize what each set is supposed to accomplish.
Substitute + Nasty Plot: Use Substitute on a passive Pokemon or when you force a switch, then use Nasty Plot to boost your Special Attack, and you can spam your STAB moves.
Substitute + Lovely Kiss: Use Lovely Kiss to put a check to sleep. Use Substitute to take advantage of the forced switch, then start spamming your STAB moves.
Lovely Kiss + Nasty Plot: Use Lovely Kiss to put a check to sleep. Use Nasty Plot to take advantage of the forced switch, then start spamming your STAB moves.
Focus Blast + Nasty Plot: A simple Nasty Plot + 3 Attacks set. Plot up, then use your boosted attacking moves.
Basically in BDSP NU, Jynx is not only demonic appearance wise, but also competitive wise, especially if you have Lovely Kiss.