Isn’t that counter-intuitive? Oracle is one of the best options for PVP.
Not only do you get Prophecy to resist most status ailments (since most are Rank 1), Death Sentence helps tremendously by reducing the enemies movement speed to 40% for up to 25 seconds, which is great in case you need to run away or want to chase an enemy.
Counter Spell removes all AoE magic on cast (nice against e.g Heavy Gravity) and reduces incoming magic damage by up to over 60% (good against Wizards and magic Clerics, especially when wearing Plate armor).
Foretell allows for short breathers by providing up to 11 seconds of invulnerability in case you’re out of skills or want to survive some opening combo like e.g. Lancers Bash>Crush>Quintainn combo.
Twist of Fate simply deletes one opponent regardless of his defense thanks to the damage boosts.
Thanks to the HP recovery reduction attribute, you can reduce the HP recovered by the skill to only 80% of the damage dealt, so even if the enemy survives the skill and manages to get away for 30 seconds, he will suffer at least a net loss of over 8% of his maximum HP.
Last but not least you get a free SP refill with Arcane Energy since you can use Arcane Energy, then use Blind Faith and your buffs, and after Arcane Energy buff ends, your SP will be restored to the point they were at when Arcane Energy was cast.
Of course, other options like Kabbalist are also possible (really strong with Inquisitor and Zealot),
but I think Oracle is by far the best choice for active PVP environment.