[Yet another player in need of help with the Glass Factory Gauntlet]

It’s because of primarina’s ability liquid voice, which turns sound moves into water type. 
That said I think your mons are quite solid actually, you just need some fine tuning in the evs. Use ev reducing berries and power items from the department store to max out your mons evs first (as in 252 in speed and the attacking stat, you’ll need ev training eventually anyways so might as well do it now). You can also tune your mons nature, not sure if you have done that already but it also helps quite a bit.

Strategy wise, the easiest one that I can see is to let volcarona set up. I would lead with stealth rock garchomp (break sashes) and screens delphox (reduce damage, also give it a light clay) if you don’t want to change your teams, then after rocks and screens are setup, switch in volcarona and quiver dance. Don’t kill ribombee while setting up because it can’t do much damage against rona. Make sure the enemies on the field cannot threaten rona and you’re good. As in, kill marowak first because shadow bone can dent rona. And set up reflect first to reduce its physical damage. Webs doesn’t matter annymore if you’re using quiver dance, since you will be at +5 speed anyway. After setting up what’s left is spamming heat wave. Also I’d give leftovers to rona or teach it giga drain for longevity. The only counter in the first battle would be primarina, which you can counter by giga drain (provided you’re at around +6 SpAtk) or by using eelektross.
As for the second and third battle, rona is still a good setup option, and additionally metagross can also be very effective. You can try agility metagross or nasty plot zoroark, a high speed metagross can beat the shit out of the enemy before they respond. Just look out for sucker punches though. Btw just my personal opinion, zoroark isn’t that consistent as a mon, it can be OP sometimes but also deadweight, so I might change it to something else like aegislash or gyarados, but that’s just me so it’s up to you to decide.

That’s what came up to my mind, hope it’ll be useful to you!

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Electrike 

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Electivire

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Exeggcute

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Entei 

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Sharpedo

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Arctozolt

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Numel

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Unown 

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Skrelp 

[Sucker Punch on Mightyene]

Mightyena learns sucker punch normally at lvl 52, but you can teach it as an egg move. You need to breed a female mightyena with mons like raticate and skuntank who knows sucker punch.

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Rampardos

[my slowbro won't evolve?]

Slowking is a branched evolution from Slowpoke, so you need to evolve it from slowpoke, not slowbro.

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Kleavor 

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Naclstack

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Empoleon

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Ting-Lu

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Yamask 

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Snivy 

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Dracovish 

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Exploud 

[Need help on Valor Summit]

Glad to help!

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Houndstone 

[Need help on Valor Summit]

Teach bounce to dragalge from the tutor in akuwa, bounce can change the field into sky field. This can reduce the field boost for typhlosion and remove passive eruption damage. Also, I believe electabuzz, talonflame and yanmega can benefit from sky field boost. Once sky field is up, I recommend using elemental seed to set up tailwind if you have it. And if scrafty has intimidate, you can try switching him in and out to lower the enemy’s attack. Also remember to max your mons levels for the highest damage :)

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Iron moth