For Salazzle's "Hot Poison" Ability, can I choose to only Poison or only Burn the opponent's Active Pokemon? Or do I have to do them both?
No, you must either apply both Special Conditions (if you are able to), or not use the Ability.
Hot Poison



x2Hot Poison
When you play this Pokémon from your hand to evolve 1 of your Pokémon during your turn, you may leave your opponent's Active Pokémon Burned and Poisoned.


FlamethrowerDiscard an Energy from this Pokémon.
For Salazzle's "Hot Poison" Ability, can I choose to only Poison or only Burn the opponent's Active Pokemon? Or do I have to do them both?
No, you must either apply both Special Conditions (if you are able to), or not use the Ability.