Me: Hey, what's up?
Friend: Nothing much, just decided to try and play through a Genocide run. I just beat Mettaton NEO, and the final boss is supposed to be extremely hard. You've played Genocide before; how well do you think I'll do in the fight?
Me: ...you are going to get so boned.
I have no regrets.
2) Not doing Magic Guard stuff anymore
3) Not really sure what this does for Cloyster. It already has a physical and special Water STAB, while Water Shruiken might be nice I don't see it being a game changer. DD is just worse than Shell Smash so that's not really a buff.
4) A) Suicune doesn't really need a buff, and B) It doesn't need THAT much of a buff