Read past your Edit, hence why I still posted. This might help others in the future, anyway.
No battle outright requires you to IV breed/EV train, but you should learn to adapt since you can expect to face more IV/EV optimized opponents at this point of the game. Every battle can either be straight-forward if you are prepared, or a roadblock if you aren't. Even then some battles will be trial and error, especially on a first playthrough.
That said, I think some general advice can help you on your way. I hope the below information is in any way useful to you. YOUR POKÉMON
CHEESE
GENERAL TIPS
BATTLE TIPS*
* These tips are just based on the battle I recall having, by no means was it a great effort. I look very little into field effects, don't do IV breeding/EV training and really only use permanently held items like Quickclaw/Plates to get a bit more damage through. Perish Song Tricker Murkrow is really my only "escape option". There will definitely be much more ways to tackle this and much better tactics to use. My point is, you can progress in Reborn with as little effort as this.
