Finally done with the challenge. I went through the god of grinding by battling the E4 and Gym Leader rematches for the past week after I beat Blue.
Crystal (Glaceon) ♀ Lv. 88 @ NeverMeltIce
Ability: Snow Cloak
Final Stats: 244/171/219/260/181/143
Moves: Dig, Shadow Ball, Icy Wind, Blizzard
Flora (Bellossom) ♀ Lv. 84 @ Quick Claw
Final Stats: 230/175/167/186/189/139
Moves: Giga Drain, Leaf Storm, Cut, Sludge Bomb
I do intend to do a male run for this challenge, but I plan to wait until I finish a few other challenges on my list.