I actually used Magnemite, but I always had it underleved because I used my Dewott and crew more.
Sig Strike #4.
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Beat Skyla. The first time her Swoobat pwned my Galvantula with Acrobatics, but the next time, she decided to use Heart Stamp instead. Skarmory and Swanna weren't much of a threat, though, once I got past Swoobat I pretty much had it in the bag.
She should just have one pokemon of each that do well vs their weaknesses. I would give her
Challenge mode Archeops.
I think Archeops is overkill for even the 6th gym's Challenge Moed. STAB 110 power Acrobatics coming off a base 140 attack is insane. Especially considering that, relatively, the strongest attack at that point was Excadrill's Bulldoze, which is about half as strong anyway.
Sigilyph is fine for Challenge Mode.
Gliscor really would be the only Pokemon that would be a good enough suit for Skyla to counter Electric types as everything else is covered. Although I think she's fine as is anyways, while her Pokemon don't have any moves or resistant to Electric types they do have:
-Swoobat's Attract, so if you are using a male, things could be annoying. Swoobat is also fast so you may not outspeed it in time.
-Skarmory's Sturdy plus Agility, unless you have Mold Breaker or similar Ability, you aren't knocking it out with one hit, it can then Speed up with Agility and probably hit you first next turn. Additionally, Challenge Mode Skarmory has a healing Berry, I'm not sure if it would heal it enough(With it taking affect after Sturdy took affect) to prevent Skyla from using a Hyper Potion, but I would think it would, which is probably why it has the Berry in the first place, this way Skarmory gets faster and still has some HP.
-In Challenge Mode there's Sigilyph who has Hypnosis, Sigilyph is fast so it could get it in first, once you're Asleep things could take a turn for the worse.
Nothing really from Swanna to deal with Electric types at all though. Even so, the other three can still counter Electric types despite being weak to them.
My battle with Burgh was surprisingly easy. I think I'm more upset that his roster barely changed from the original; Swadloon in place of Whirlipede makes sense, but why keep Dwebble? Anyway, I'm terrified of battling Skyla later on; her Skarmory alone makes me uneasy. Also, I'm not liking the huge level gap between her team's and Drayden's.