What the fuck, /vp/? OP is just asking for the best Pokémon hack. What part of that is bait?
Anyways, I haven't played many hackroms but BlazeBlack 2/VoltWhite 2 are definitely awesome. Aesthetically they're exactly like B2W2, but the levels are much higher, the difficulty is higher, the amount of aviable Pokémon is higher, everything is fucking higher. That game is the definition of Challenge, and a Nuzlocke there is equal to suicide.