For v13 I used Grapploct with a focus sash so I octolocked on turn one lowered its defenses, then I used someone with magical seed to setup trick room and was able to one shot its shields and kill it in like 3 or 4 hits
Cinderace, Inteleon, Grimmsnarl, Scizor, Zangoose, and A-Chandelure are the mons I finished the game with and some mons I had used at one point but have been replaced are Dreadnaw, A-Milotic, Lucario, Grapploct, Mismagius, Beheeyem, and Pachirisu