Go ahead, Pikachu can't log in. There are two situations: one is because of the official system, the other is because of the player's own mobile phone problem. The main solutions are as follows.
1. Official reason: the official server maintenance period is unable to log in, the other part to go to Pikachu version and bug, players can upgrade to the latest version and then log in.
2. Self reasons: when the mobile phone system version is too low or the cache is full or the memory is too small, players can release the cache or unload idle software to improve the memory.