This is Blaze Black 2.
My current team is Magneton, Charmeleon, Lucario, Dwebble, Sandslash, and Hitmonchan.
I switched out my Hypno and Butterfree for the rock and ground types.
They're all level 31 with Dwebble being 32. I have a quick claw on Dwebble and a Sitrus Berry on Lucario.
I'm assuming Magneton has thunder wave here, which sounds right because Magneton should probably have a moveset of:
Electric move/Steel move/Thunder Wave/Supersonic or Metal Sound
Haven't played this, but looking at her team:
1) Magneton hard walls both Emolga and Ampharos, and does decent damage to Emolga and Lanturn
2) Sandslash has the least to fear from Ampharos and Zebstrika
3) Dwebble evolves at level 34, which should help a BUNCH.
Sandslash will probably need the Sitrus Berry for this fight
What makes this difficult is every pokemon having U-turn or volt switch. I'd probably say lead with Hitmonchan and try to absorb the Flying Gem Acrobatics with Magneton (not sure if it leads with Light Screen first though). That lets your Sandslash come in on it much easier (not free though).
I'd guess the AI either uses light screen or u-turns to Electabuzz, which seems to hit hard all around. The only pokemon it doesn't have SE coverage on are Dwebble (let's say crustle) and Charmeleon. Regardless, because it's using U-turn, stay in with Magneton and use Thunder Wave.
Electabuzz is paralyzed, throw Charmeleon in there, use a random move so that when he brings in Lanturn, it loses its air balloon, then use Lucario and Bone Rush to KO.
If Bone Rush can't KO it at this point, bring in Hitmonchan instead. Because it should (?) be faster than Lanturn, Elsa will probably switch instead of using volt switch, and bring in Emolga, so switch to Crustle against Acrobatics, hit incoming Ampharos with something, then bring in Sandslash against the Power Gem. Here, use Rock Tomb with Sandslash, it will either KO Emolga (?) or slow Lanturn so that it can be KOd by a ground type move.
If it doesn't KO Emolga, and Rock Tomb doesn't slow it down enough, switch to Magneton. She switches to Electabuzz, you use supersonic/metal sound, you switch to Hitmonchan. Either she switches to Emolga, in which case hit it with your best move for neutral damage, or she stays in and you deal as much damage to Electabuzz before it KOs Hitmonchan with Psychic.
If against Emolga, bring in Crustle, and attack incoming Ampharos, then switch to Sandslash and use Rock Tomb to KO Emolga. She probably switches in Lanturn at this point, sack Crustle here, bring in Lucario, use Bone Rush and KO the 2nd time you use the move. She probably brings in Zebstrika, so switch in Sandslash against overheat, using up the white herb, KO or do a bunch of damage to Zebstrika with ground type moves. If she stays in with Zebstrika and Sandslash gets badly weakened, then use Sandslash to KO Electabuzz if it's brought in. If Ampharos is brought it, use Magneton, so that she brings in Electabuzz, and either KO Electabuzz (free win) or get KOd (bring in Sandslash, KO Electabuzz and damage Ampharos so that Lucario can finish)
If she switches at some point to reset Overheat drops, Sandslash should 2HKO everything, and all of the ;ast pokemon would be KOd on the 2nd turn because Sandslash outspeeds (probably). Using Lucario and Magneton to absorb overheats, just continue to bring Sandslash in against weakened Zebstrika and KO remaining pokemon.
If against Electabuzz after it KOd Hitmonchan, bring in Sandslash and use Rock Tomb against incoming Emolga to KO. Sandslash can deal with the remaining pokemon. Use Magneton to KO or weaken Electabuzz, so Sandslash doesn't have to worry about healthy Electabuzz surviving it. Bait Overheats with Magneton/Lucario again.
Going WAAAY back, if Bone Rush CAN KO Lanturn, bring in Lucario and Bone Rush to KO. She'll probably bring in Emolga, attack the turn you switch to Magneton, then switch to Zebstrika or Electabuzz.
Make Magneton use thunder wave, if Zebstrika gets paralyzed, EITHER:
If Crustle doesn't have Stealth Rocks, use Crustle to absorb 1st Overheat, possibly 2nd, basically sacking it while using Rock Slide to safely bring in Sandslash, so that Sandslash can Rock Tomb Emolga on the switch in. If Rock Tomb doesn't KO it or drop it's speed low enough for Sandslash to KO, do a Magneton to Electabuzz switch cycle, bring in Hitmonchan, and either hit Emolga with a strong neutral move to help KO before repeating cycle until Hitmonchan gets KO'd by Electabuzz, or stay in and damage Electabuzz until Hitmonchan is KO'd by it. Either way, bring in Sandslash again, 2nd Rock Tomb should KO here (if not...., repeat this shit, and just have Sandslash tank the possible Cross Chop from paralyzed Electabuzz when bringing it in. Might bring it too low to deal with full power Overheat though).
Worst case scenario, low health Sandslash KOs Emolga, she brings in Zebstrika, you sack Lucario, bring in Sandslash, KO Electabuzz, bring in Zebstrika, sack Magneton, Sandslash 2HKO Ampharos, and I'm not sure Sandslash survives overheat here. KO?, go grind some more.
If Crustle DOES have stealth rocks, Zebstrika switch means switch to Sandslash, absorb 1st Overheat, predict Emolga switch and switch to Crustle.
With Crustle vs Emolga, either hit hard with Rock Slide as you can or use stealth rocks. I'm not sure if game logic would say to go for Acrobatics or to switch out, if the former, use Rock Slide.
If Crustle KOs Emolga, just hit hard from there on out; Lucario's Bone Rush works past Ampharos's Shuca berry, Sandslash is what you need to deal with Zebstrika, and Magneton walls Ampharos. Probably dealing with some cycle of
Ampharos-->Magneton-->Electabuzz,
at which point you sack Crustle to safely bring Sandslash in, and either sweep with it using remaining pokemon to bait and absorb strong Overheats.
If she switches Emolga out, she'll probably switch to Ampharos, use stealth rocks. Then use Magneton --> Electabuzz --> Hitmonchan --> Emolga --> Magneton to repeatedly wear down Emolga. In case she ever switches to Zebstrika against Magneton, be using thunder wave repeatedly (the mix of Stealth Rocks and Sandslash outspeeding everything but Emogla which Magneton beats basically wins the battle if this happens). If she ever stays in with Electabuzz to KO Hitmonchan, use Sandslash Rock Tomb trap to damage Emolga to were Stealth Rocks ensures it's done for the battle, sacking Crustle if you have to do this twice, leading to essentially a repeat of one of the earlier scenarios.
Going WAAAAY back again, if she switches Electabuzz in after KOing Lanturn, use Hitmonchan to damage Electabuzz. If she switches to Emolga, repeat pattern, and if not, keep going until either Electabuzz KOs Hitmonchan and you bring in Sandslash for your first Rock Tomb against Emolga, Magneton switch, bring Crustle in against Electabuzz until it's KOd, leading to either Emolga getting KOd by Rock Tomb on the switch (Sandslash sweeps here) or Sandslash KOs Zebstrika (Sandslash/Lucario outspeed and KO Electabuzz and Magneton walls last pokemon).
OR Hitmonchan KOs Electabuzz, at which point Emolga to Magneton will lead to Zebstrika getting paralyzed, Crustle sack, bring in Sandslash, first Rock Tomb against Emolga, Magneton to Electabuzz to Crustle and victory more assured because Sandslash and Lucario outspeed Zebstrika
I assumed a pretty brutal AI, and the AI acting smartly with switching. If the AI isn't switching Emolga or Lanturn in against Sandslash, then battle is easier, just attack normally. Even if the battle doesn't play out this way, many of the situations I mention will probably come up. Overall principles as I was writing this seem to be:
1) Magneton hard walling Emolga and Armpharos can be used to spread paralysis
2) Sandslash + Lucario only can't sweep ONLY because of faster pokemon
3) Use up Zebstrika's 1st overheat with white herb before going for it
4) Use charmeleon, Hitmonchan, and Crustle more as lures and sacks, they don't have specific roles.
5) Try to keep Sandslash as healthy as possible