hacked mons as in created on PKHeX can be used online if they're legal. so no huge power slaking . you can however use those pokemon in offline battles (so playing with IRL friends)
you can use the rom online but it would act like a normal rom ( your changes wouldn't take place in online battles etc )
PKHeX is just a save editor , so you wont be able to "rom hack" using it
gateway sysnand mode ? how do i go into that if i may ask ? and to clear things up i do this :
get blue card r4i onto blue card + devmenu/FBI
go to gateway sysnand mode
instal bluecardfix
?
my DSlite just broke so i can no longer play any NDS games , but thank god i have a gateway to use the bluecard .Now i know that i CAN play NDS games on my BlueCard , but my Question is How ?