I just used an Action Replay on my Black. Before anyone goes nuts, I only used it to get Keldeo, Meloetta, Genesect, Darkrai, and Arceus, which I had no way of getting otherwise. I got them mostly at level 35 since I don't care for instant level 100s. Although they are strong, I've hardly used them at all.
I randomly have Tornadus in my party although I've hardly used it either. The reason is that I want to beat the Elite Four again. You know that thing at the end where it shows each of your Pokemon and has a backdrop with one of its types? I want to see what that backdrop looks like for Flying type.
My current team:
Bisharp, lv. 71 - Dig, Night Slash, Iron Head, Rock Smash
Archeops, lv. 67 - Fly, Stone Edge, Shadow Claw, Dragonbreath
Musharna, lv. 43 - Psywave, Shadow Ball, Psybeam, Yawn
Gliscor, lv. 55 - Dig, Sludge Bomb, X-Scissor, Guillotine
Tornadus, lv. 41 - Revenge, Air Cutter, Extrasensory, Sludge Bomb
Zweilous, lv. 50 - Crunch, Body Slam, Dragon Pulse, Dragon Rush