The Pastoria City Gym is the water gym.
The Gym leader uses 3 Pokemon.
2 of those 3 Pokemon are super weak to Electricity, while one of them is Water/Ground, which means it is Super weak to Grass.
The short answer to this is that you should at least have a level 36 Grass type and/or a Level 36 Electric type.
If you want plain, easy sailing, you HAVE to have a level 36+ grass and a level 36+ Electric type. A level 36+ Grass type is your minimum.
Personally, I owned the gym with a level 37 Leafeon (Solar Beam, Magic Leaf, Synthesis and Quick Attack) and Level 40 Luxray (Thunder, Shock Wave, Spark, Tackle and Bite)
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Zubat cannot learn Scary Face at any level.
75 to 80
Your Pokemon should be around levels 32 or higher and use super effective moves on her Pokemon as well like fire, flying, ice and poison are really affective they do 2x damage.
Scary Face is not a TM or HM in the game. It's a move that Pokemon can learn by level up or by breeding.
lvl 3 at the end