From Bulbapedia, the community-driven Pokémon encyclopedia.
The Frozen Zoroark glitch is a glitch that occurs in the Japanese versions of Pokémon Black 2 and White 2. If performed before the game is saved without a previous reset, it will severely affect the storyline. This bug was fixed in international releases.
Performing the glitch
After the player beats the Champion, it will be possible to access the ruins of N's Castle, by following N's Zoroark at the Victory Road. If such Pokémon is followed through the Victory Road and then the area is left, without Zoroark being followed until the end, it will appear in its initial position upon the next visits, and will not move.
This game anomaly prevents the player from meeting N and from experiencing other significant events, like the battle with his ZekromB2/ReshiramW2 and with the Normal form Kyurem.
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