In the 60's, watch out for her Garchomp who is Level 66.
lucians bronzong and cynthias garchomp
Lv.60 or over and have 1 Lv.100. That's how i beat Cynthia.
For BEST results, you should be about level 55. when i beat it mine were level 57 and above, cynthias garchomp is lv. 62!!
December
5'7
celestic town
You don't have to see her afterwards.
nothing
she has a lvl 75 spiritomb, milotic, eelektross, braviary and lucario and a lvl 77 garchomp
In Diamond and Pearl it's level sixty-one. In Platinum, it's level fifty-eight, then level seventy-four when you rematch her.
she does not have a house. you have to beat the elite 4 to see where she lives because she is the champ
cynthias grand mother will give it to you after you save there village from a bomb