As long as Jynx is an Evolved Pokémon, prevent all effects of opponent's attacks, except damage, done to Jynx, and Jynx has no Weakness.

Freeze Light

Flip a coin. If heads, the Defending Pokémon is now Paralyzed. If tails, the Defending Pokémon is now Burned.

Pure Power

Put 4 damage counters on your opponent's Pokémon in any way you like.