7ravens

Speaking from experience from replaying v13 and playing on intense: I got the whirlpool tm from the hotel in east gearen in like chapter 1-2. If you have that and a fast water type an easy way to cheese her is use your own whirpooler to hax all her mons. If you don't have that tm or want a legit consistent strategy to beat her what you need are a team of electric types and a mon with soak. Grass types really dont cut it vs her. Almost her entire team with mons such as qwuilfish, tentacruel, primarina, whishcash with the crest, and her soak + tbolt lanturn will dumpster your grass types. You need to abuse the water field that boosts electric by 1.5x. I'd legit go with 4 electric types and 1-2 mons with soak (so you can beat the whishcash and the lanturn) to reliably beat her. Some good electric types that I can name off the top of my head that you could have by now are luxray,bolthund,raichu, and plusle. Some mons with soak are basculin if you have it, or you can catch a pyukumuku on the beach and rare candy it up to lvl 41 and learn soak and then reverse candy it back down. Another option is if you somehow have a mon with blizzard you can change her field and ruin her team, although i don't think theres any obtainable mons that can have blizzard pre-40. TLDR if you dont have a few good electric mons, your not beating her without a bunch of luck going your way. I really think the devs need to give you a way to go back to east gearen and other regions before this fight. Valerie is much harder than she was on previous versions and without multiple good electric mons its very possible to get softlocked on her.

I just beat her very recently. You can catch an unburden drifloon on the path to the wispy tower (although very low chance). You can also find a ghost gem laying around somewhere on that path too. Altho even with the unburden + ghost boosted moves you'll only take out 1-2 mons at most since she'll shadow sneak you down. On route 3 you can get bolthund with strong jaw crunch which can take out the mismagious. You can also get espurr (i'd recommend you reset until you get a male one with own tempo since that gives you prankster when it evolves). Meowstic naturally learns both reflect and light screen with prankster so that can help your drifloon/bolthund take an extra hit or two.

Let me just preface this by saying that I play on intense difficulty. With the release of ep 13 I decided to do a new playthrough to see all the new material added throughout the game. One thing is I've noticed that gym leaders are significantly more difficult that before. A lot of it comes down to wild Pokémon such as meditate (before gym 3) and swoobat (before gym 1) being moved to different parts of the game. So far I think thats been okay but what really gets me is all the super-accurate sleep moves that the new leaders are getting. The 3rd gym with the stantler crest and hypnosis is kinda nuts to play against since stantler hits like a truck and few mons will outspeed it at that point in the game, especially with the ev training moved later in the game. The 4th gym with the unburden drifblim and super accurate hypnosis( from the field) that just puts your whole team to sleep without you being able to play is just not fun. As far as Im aware the only insomia mons you can get at this point are noctowland araidos, both of which cant take on the drifblim (since ghost is super effect against normal on the field, and dark is nerfed so you cant sucker punch it with ariados). Just wondering how the devs thought we were supposed to take this on. *edit at this point we also get drowzee pumpkaboo and shuppet with insomnia. Not that any of those mons are particularly good against a ghost gym.