It also depends on speed and how fast you get an empoleon up. If you get a fast Empoleon(Basically you need it by T2), you have a very good chance of winning. It's all about Empoleon in this matchup, as with Kingdra's Body and attack for 80, Prinplup is very weak.The Kingdra matchup depends entirely on if you can get a Cessation to stick. If you can, you basically win. If not, you lose.
Heres my records of the 5 BRs I have been to.
#1: 3-2 Empoleon/Raichu d
#2: 3-2 Emploeon/Raichu d
#3: 6-1 Empleon/Blissey (Won BR)
#4: 3-2 Emploeon/Blissey (The 2 losses were my fault; Misplays)
#5: 6-1 Emploeonn/Blissey (Won BR)
Absol ex would go nicely, but you'll have to time it carefully because of Zzzap