In my physical copy White 2, All I had to do was type the Japanese name of Reshiram into the computer to get through. I've heard horror stories on being stuck there in the game.
I actually beat the game rather quickly. right now I'm working on completing all the Pokewood movies. Then on to the Pokemon World Tournament. I already caught all the Legendaries and Interactable Pokemon, caught all of N's Pokemon, Beat the big tree in White Forest, completed the Unova and National Pokedexes, and I've got to try out all six of the new formes.
I also FINALLY caught an Imposter Ditto, which is one of the big things I wanted from this game. I still need to complete the lost item sidequest and get any of the ingame trades, even the non-lost item ones.