Originally Posted by Fat callforjudgement
I may have to say BW Cynthia, given that I soloed her with a freshly caught wild Pokémon.
The problem is her Spiritomb's moveset. Sucker Punch / Shadow Sneak / Will-O-Wisp / Double Team. Out of those moves, the first doesn't hit things that don't attack, the second doesn't hit Normal types, the third doesn't hit (or at least, doesn't negatively affect) Magic Guard Pokémon with no physical attacks, and the fourth doesn't hit anything.
So bring out a Magic Guard Clefairy, and Spiritomb can't do anything. I gave mine a moveset of Cosmic Power / Work Up / Stored Power / Toxic (all TMs or relearner moves, so no training required), and set up to +6 / +6 / +6 / +6 against it. Then killed it with Toxic, then swept the rest of her team.
I don't think I've actually ever fought her normally. (Later on, I'd stick competitive Pokémon I was training up for VGC in my party, with Exp. Shares, and let Clefairy solo her to donate them experience.)
That's like saying that some really good team in OU is terrible (let's say, stall) because it's 6-0'd by some random niche NU Pokemon. I have to say that that is a really interesting strategy, though.
Originally Posted by Fat Zacchaeus
All of them in BW? Seriously, whenever people think about the most difficult NPC battles they've had, 9 times out of 10 those battles are in the first 3 generations. BW was just laughably easy so hopefully BW2 can change that up a bit
Ghestis and Lenora were really annoying. I remember overleveling my Pignite to like level 24 in a nuzlocke just to beat Lenora and I still lost (partly thanks to hax; mostly thanks to Lenora just being really annoying to battle in general).