This is how I got my Raichu to Lv100. Head to fuchia and go right. If you don't detour you will come to a corner. "Twins Kiri and Jan" will be there, look farther right. Battle with "Bird Keeper Benny", whom you should have battled once before. He will use 2 Lv49 Fearow, so don't use low-levels, only at least Lv45 Electric- Types. Keep Battling him and soon your Electric- Type will be very High-Leveling.