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Caught a Zubat in the cave north of Jubilife, caught a Wurmple in the route above that, lost out on an Abra on the route east, caught a Psyduck in the Oreburgh cave, Geodude in the mine, and Machop in the route above Oreburgh. After boxing everybody who I felt wouldn't be too helpful in the near future, I fought the gym trainers and grinded everyone up to level 14. That took nearly 2 hours.
Fortunately, it paid off because Psyduck absolutely bodied Geodude and Onix, Staravia (Starly evolves at 14! I totally forgot about that!) Intimidated the Cranidos, which allowed for Turtwig to get not one, not two, but THREE Quick Claws in a row, defeating the Cranidos, and Roark, with no deaths. Onwards towards the forest, the game gets much harder from here.