Thank you both for your answers.
In my opinion, unless you're using TMs or are near the Move Relearner (I'm assuming you're playing Purple), she doesn't have too many options. She'll get Tailwind in another two levels, but without the Relearner she'll be getting her strongest STAB moves rather late (On the Steel side, your only other options are Blade Flash, provided that you didn't delete it yet, and Cut...). It also depends on her Ability (one of which depends on Weather, another that could be useful if you make use of Rest) as well as her Nature.
You could always reset EVs, I suppose, but you may be better off with regular Momiji (or DKeine if you want a defensive Beast Type. At least that gets Intimidate).
I play purple, yes. In my opinion the only non-broken Touhoumon game I've tried (I have yet to try Unnamed, but it has those songs ugh). I don't pay attention to nature and IV/EV, since it never was a problem in any Pokèmon or Puppet play. About moves, I'm right before the fight against rival after the Weather Institute battle, so I don't have the access yet.
Non-expert just having a look over the stats in the wiki:
- Check your nature and IV's if possible, It's possible the Momiji is bad and the Medicine is good (AMedicine has comparable special bulk, possibly enough that with natures and IV's/EV's it could come out better on that front). In particular the base S.def of both mons are the same so compare the two, it could be a hint that the Momiji is bad on that side.
- Is Momiji attracting fire coverage? Double weaknesses are not fun. It also has less resists in general which is unhelpful.
- Beast inherited rock's old special defense boost in sand which combined with potential sand veil will help alot. Give it a Suika with sand stream as a partner if you can.
As for moves it gets tailwind at 44, which lets it fix its attack and speed and try to sweep which could work very well if you can get it in on something it can tank. I'm not seeing much else though.
Again, EV/IV and Nature are not my focus. If it helps, my AMedicine has 75 DEF and 91 SPDEF, while DMomiji has 105 DEF and 45 SPDEF. Both are at LV 42.
She can takes a few hits (if they are physical, special just destroy her), but her poor attacks doesn't let me to counter properly. I guess I can switch her when I build my final team, since right now I'm just beating the game. And I never used her against fire, because that 4x damage is a OHKO every time.
I wished there was a move that would let her tank the next attack (like, using her shield to actually protect herself, lowering damage) and then counter. But I guess in Pokèmon that would be a little OP.
Again, thanks for your answers. I guess I'll stick with her till before the Elite 4 and make a decision then. I don't really want to get rid of her since she was my 2nd best against Norman's AdYukari (That was an intense fight ^_^).