Alright so basically, Tydus Mcfarline has used Celebi to alter the past and take over the world. Everyone who wasn't with Silver at the shrine reverts to the alternate version of them self in this new reality. Basically your character has no memory of the regular reality.
Also we're starting an arc called the Celebi arc very soon. Time's going to be temporarily screwed up. Only the characters that are present in Celebi's shrine at the grass gym in Lake Lure will come out of the time shift with their memories.