Widely regarded as the greatest Pokemon games of all time. I'd say for a reason, you see this is peak of the series. Gen 3-5 is golden era and these 2 games have everything original BW misses. It's a perfect experience, there's even a challenge mode. To understand how good BW2 are you need to realize that modern games and remakes are so bad that most of the fans make mods (like for example Platinum mods in Gen 4 BDSP remakes) and even then these moded games have less content than BW2. There's no way Gamefreak makes a new game that is better than these right here, it's peak Pokemon.