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You have to use dive quite a few times, but the dive sprite isn't edited for some reason.
Talking to the NPCs I find out that all of the E4 have some kind of special OHKO moves and one of them even wields a Fakemon made out of pure edge.
The Victory Road is really a different kind of hell. It's split up into three parts.
The first part is almost corridor like and you fight a bunch of Cool Trainers. Then the fun begins; the second part of it is an ice sliding puzzle and if you fall into a hole you have to start at the beginning again. The third part is some kind of maze with invisible walls. If you stock up on repels the whole area probably becomes a lot less frustrating and there are surprisingly few trainers.
At the end your rival challenges you to a battle, but you have to defeat his two friends first. They have four Scrafty and Tyranitar on Lv 67 each and the rival's Pokémon are on Lv 60 - 65, which makes the whole thing kinda ridiculous. But you can't heal between the battles.
I guess before I take on the E4 I'll go grind a bit.