Hi, I'm having trouble with valerie. I can't seem to find how to beat her with the pokemon I have at my disposal, and since we're stuck on the beach, I can't go back to catch what I need, what do I do ? Here is my team : 
Unfezant (42) 
rivalry 
brave 
quick attack 
facade 
air slash 
air cutter 
cofagrigus (41) 
modest 
mummy 
scary face 
shadow ball 
will-o-wisp 
curse 
meowstic (42) 
keen eye 
sassy 
psychic 
light screen 
shadow ball 
charge beam 
diggersby (43) 
huge power 
lax 
dig 
take down 
quick attack 
bounce 
medicham (44) 
bold 
pure power 
high jump kick 
meditate 
feint 
force palm 
blaziken (44) 
brave 
speed boost 
double kick 
bulk up 
blaze kick 
flame charge 
In store I have pyroar, lombre (without a grass stab) and gloom but without leaf stone 'and they get 2hko or can't do anything back at level 44) and vivillon. 
I always get 2 mons out of the way with meowstic, but after that I get no kills and all my mons die right away. I've tried with lombre and gloom but it was somehow worse as they couldn't do crap, especially lombre since you don't get it as a lotad. 
On the beach I have access to krabby, weepinbell (but again, no leaf stone) and goldeen from memory. 
Once I managed to set up three bulk with blaziken and got +3 speed with politoed, slowbro and lanturn out of the way, but I still got outsped and died to a crit shadow ball from rotom-w. But I don't think it would have cut it anyway since I don't have access to high jump kick despite having three heart scales since you are stuck on the beach, milotic would probably have lived if I was only +2 with just double kick so killing the rotom at +2 isn't really an option I think not mentionning I'm slower anyway even at +3 speed. And I probably won't get to kill the slowbro again haha I killed it with a crit take down from diggersby because it had set up a calm mind instead of attacking (it was obviously faster) and blaziken ain't never breaking through the slowbro and apparently I need at least +4 to outspeed the rotom. 
If only I could go back and catch some things I could use or if I had leaf stones I could probably eventually beat Valerie, but with only what I have at my disposal I don't see how I can do it, so any help is appreciated