Axelyx

Regarding your aegislash, the moveset I will use is kings shield/swords dance/iron head/shadow sneak, then give it an EV spread of 252ATK/252SPDEF. Kings shield already is a way of lowering the enemy’s attack (thus increasing your defense), so IMO iron defense is a little redundant. Aegislash doesn’t have a way to increase sp.def, so maximising it would be a good way to mitigate that. Shadow sneak is changeable with other moves depending on the situation, like secret sword etc. Excadrill/krookodile is also a bit redundant since you have repeating types, I’d suggest changing one of them to rotom maybe, rotom is a really versatile mon (will-o-wisp, volt switch) and you can change its form depending on the situation. Normally I like to keep rotom-wash but that is up to you :)

Your team is quite solid actually, mind sharing their movesets, IVs/EVs etc?

For me it’s vivillon and venomoth! Both function almost the same, with compound eyes/tinted lens, sleep powder, quiver dance and substitute, slower mons are all setup fodder to them. These nimble butterflies can really do more than expected XD

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!

Electrike

Electivire

Exeggcute

Entei

Sharpedo

Arctozolt

Numel

Unown

Skrelp

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.

Rampardos

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

Kleavor

Naclstack

Empoleon

Ting-Lu

Yamask

Snivy

Dracovish

Exploud

Glad to help!