Most hardcore Nintendo franchises

[LG[Infinite]]

Do you mean me? I put Fire Emblem as the MOST hard core. As for Smash, I'm not so sure. I know it can be really, really hard core, but unlike Fire Emblem it doesn't have to be. You can enjoy it, for the most part and finish it, without crying yourself to sleep. If, however, you include getting to tournament standard, then yes, it's pretty hard core. Bleeding hands are about as core as you can get.