Everyone has their first, and perhaps to get through the story, many have avoided guidelines and spoilers, turning to NPCs in-game to figure out what to do next.
The Gym Leaders are one of the biggest challenges you face, and the question is:
Who surprised you the most when you battled them?
There are moments when you just yell out a swear word because you had been completely unprepared for a certain pokemon, or a certain move.
There were quite a few for me, but I should say Fantina because I didn't know about Aftermath and was shocked when my pokemon died when I KO'd her Drifblim, and Roark because I didn't know Cranidos had such a high attack - one Headbutt cut over half my HP ;_;
And no mentions of cut scenes because I know if I allowed that, everyone's going to talk about Elesa's B2W2 cutscene. Nope, not that. I mean battles.