I never played gen 7 OU in the past because I was taking a break from comp mons at that point but because of the whole quarantine thing I've been giving it a spin. I only played a bit and I have a few questions for people who have played

>Why is it so common for CB Bulu to use both wood hammer and horn leech? Both are good attacking moves and they do have a degree of synergy despite being the same type but wouldn't bulu get a lot of mileage out of something to slap its checks like megahorn for bulky grass or zen headbutt for poison types? Or even something like toxic or nature's madness.
> If you want something to use SR+Stone edge+EQ+SD, is it better to use garchomp or landorus? The former is bulkier and faster, the latter has a better ability, hits harder, has more viable sets that your opponent has to figure out, and has a typing that makes it easier to build around.
>what's your opinion on Hoopa Unbound? Is this shit good/worth prepping for?