Sorry for the lack of updates. Life has been crazy for a while, and on top of that I still don't have motivation to work on it more. But once I do, you can expect to see some fixes, at the very least.
It's supposed to be a bit harder than Renegade Platinum. For the most part, ordinary trainers are the same, but boss trainers (like Galactic Admins, Gym Leaders, etc.) are significantly harder. Gym Leaders are no longer limited to a specific type- now they use a central strategy, like a rain team or hyper offense.
However, breeding and EV training are entirely unnecessary. In the case of EV training, it's actually impossible, since you can no longer gain EVs. This was changed because NPC trainers can't use EVs, so they provide a huge advantage to the player. IVs are still random, unfortunately, but they're not really a huge deal, especially not compared to EVs. If you like, you can edit your Pokemon with a save editor to max out their IVs. I wouldn't consider that cheating, since I'd add bottle caps if I could.
You do, however, have easy access to competitive items in the Veilstone Department Store, and a wide variety of viable Pokemon to choose from, so team building is much easier, and you can win with your favorites, since the vast majority of underpowered Pokemon have been majorly buffed.
So it's kind of tough to say if it would be too hard for you or not. The tedious, grinding aspect of the harder Pokemon hacks is absent, however the enemy trainers use better team compositions, items and movesets, so you have to know that aspect of the game decently well to succeed. I recommend having the documentation handy, and checking it often while playing.
That is... a Delta Patcher issue. I can't really help you, since this tells me nothing.