Most notably Gym Leaders, your rival and the Elite Four have all been made significantly tougher. This has also raised the level curve of the game, meaning you can expect to beat the first round of the Elite Four somewhere in the 70s levelwise. The exception to this at present are the Dome trainers, as they aren’t really necessary and there’s no proper trainer editing tool available for B2W2 yet. → The rosters of almost all of the trainers in the game have been edited.
Most areas now contain at least 8 Pokémon species, and in most cases, more! You’ll be able to attain a complete PokéDex within the limits of the game itself, and the majority of Pokémon are available no later than the seventh badge, meaning you can form basically any team you want! There’s a couple legendaries that you can’t get until after the Elite Four, but aside from that… The wild Pokémon have been edited in each and every area of the game. So basically, just pick whichever colour takes your fancy!
→ Additionally, the two versions only differ in terms of their aesthetic differences, such as the appearance of Opelucid City, the title screen, etcetera. If I’m not mistaken, these are also the first Black 2 and White 2 hacks on offer. There’s also a large amount of alternative features these hacks offer, which range from differences to the Pokémon themselves to the presence of a couple new TMs. The usual rules with my hacks apply the main feature is that all 649 Pokémon are available for capture somewhere in the game, and the trainers have all had their rosters changed in order to maintain a much harder challenge than the original game, as well as having an increased variety of opponents to fight.
Pokémon Blaze Black 2 & Pokémon Volt White 2 are essentially the sequels to my Black & White hacks known as Blaze Black and Volt White.