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BW2 is poorly made because it has no difficulty and virtually no meaningful interaction during the campaign, and the postgame is gutted for lazily implemented nostalgia wank and reused maps with zero replayability.
All the Trainers and Gym Leaders use Pokémon with 0 EVs so they're extremely easy to sweep with a single overleveled Pokémon. Unlike previous (and newer) games, the Gym Leaders only use three Pokémon, often with unoptimal movesets, and the Elite Four only use four Pokémon.
The EXP balancing is such that overleveling even multiple Pokemon is extraordinarily easy and the game never gives you a real reason to use more than one Pokémon due to said overleveling rendering the other's games mechanics such as type matchups completely redundant, on top of the fact that there's no party wide EXP Share, meaning the game actually punishes you for training multiple Pokémon since you are just splitting EXP for no benefit when you could just be min/maxing it to one Pokémon instead. The game then gives you a Lucky Egg literally for free during the story, despite it being extremely difficult to obtain in earlier games for balancing reasons, further breaking the game's difficulty so it's even more of a joke.
The Challenge Mode, which is not only virtually impossible to use without hacking thanks to its obtuse requirement of having to connect with someone else who already beat a specific version of the game to transfer you a key (you can't even beat the game yourself and restart the save file since restarting your save file ALSO deletes the key...), isn't even programmed correctly, with enemy opponents having the stats of their original levels, resulting in getting even MORE inflated EXP while fighting opponents that are equally as easy, making the game even easier than if you didn't use Challenge Mode.
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