Yin Black is amazing. It can be seen all the hard work it took you to do such an amazing hack. Congratulations. I am in front of the first leader gym, with Lv15 Roselia, Lv14 Tepig, and Lv12 Frillish. Is Roselia worth training? Because it died many times when Budew, it was hard to train it up to level 15. And I have doubts about Frillish. The problem is that the one I caught was Lv11, and thus it doesn't have Bubble. Do you think there are better options than them both?
And there is something odd with wild Pokémon battles, but you may already know about it. When in battle, if I for instance have Tepig as my first Pokémon, and I try running away, it says: "Tepig got away safely!" But, if I have Tepig, and then I switch into Frillish and then run, it still says: "Tepig got away safely!", However, I am not using Tepig, I am using Frillish. Sorry for my bad English, as I am Spanish.
Edit: OMG, what is that Eevee!? He crushed my whole team... He OHKOed Roselia with a critical Quick Attack (unboosted). I am still in the battle, with my level 11 Finneon, who with Charm and Hypnosis forced Eevee out, and he switched in Mantyke. I don't understand why, but Mantyke is using Bubble Beam against my Storm Drain Finneon, so he is boosting my stats. But I am going to lose, with Roselia, Tepig and Frillish KO. Finneon's Quick Attack does pathetic damage to Mantyke.