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This happened qith my 0-exp pidgey after beating Victini's stage. No crown and no exp+
Exp is around 10.5 background bars (out of 16). 10.5/16 * 150 (exp needed from lv4 to lv5) is 99
So, 399 exp, for 7 turns, means a multiplier of 57.
It must be wrong, but can't quite put my finger on it...