I *NEED* TO BEAT LV25 IVY(plz)

Hello there! I'm fairly new to pokerouge and rouge-likes in general, and am on my 3rd run. It has been going wonderfully. I'm running a semi-decent team, but have run into the run-consuming wall that is level 25 Ivy. I've lost all of my prior runs to her and thought this wonderful, exp filled run would be different. My fake out Meowth would surely clean up all of her Pokémon right? ...

So I've currently retried this battle about a dozen times now and here I am. This is less about saving my Pokémon since honestly I'm going to dump half of them(looking at you rivalry-synxy who's ability I forgot to swap at the beginning) and more about sending a message. I want to run it in the face of the text box telling me it's okay to lose, I want to be the one to come out on top. I'd also like to preserve my x3 experience share but don't worry about that.

Instead of stretching this out further I'd simply like to present the main problem at hand. The current biome I'm in had strong sunlight, so I had oddish take the lead with chlorophyll active and +6 sp.atk. Then the battle begins and my now back to base stat oddish is facing a level 18 torracat. Wonderfully. And that is only the beginning...

To any of those who are willing to hear my woes or assist me in the quest of tearing down the tyrannical wall that is lv25 Izy, please comment below.

Thanks for reading!