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Decent Ace trainer served as a miniboss for the cave. More importantly, Pawful learned the elemental fangs. Firefang is obviously the gem here as it is my only thing for Magnemite. I passed on Thunderfang for Howl. Between Grn Diglett and Flaafy, it was redundant. Neutral Crunch and Super Effective Ice Fang do the same damage, so it is only useful for extra PP and Dragonite/Salamence/Gligar, but it is better than Tackle.
Got to Union Cave and caught Machop. Impish nature so no Specschamp for this run. It is replacing Meditite for now; I'm saturated with Psychic types.
I see some Arons in the cave. Aggron is god ingame, but it has a Slow level curve, so keep that in mind if you want to use one.