It's those abilities that make Silver Wind one of the best abilities in the entire game. You cannot be immunized from it; you cannot have an ability to screw it over; and when you use it, you get stat buffs, including Speed (oh glorious speed) if you're lucky, which is considerably more often than in the games. To say nothing of PP up/Ginseng items.

AS for starters: Treeko. There's a reason Grovyle is a thing, it's subtly hinting at you picking its pre-evolved form to have a fun time, because Bullet Seed (which doesn't require skill link to run) + STAB + Concentrator + Gap Prober = Everything dying. And then there's Agility, and then there's no abilities that can nullify the damage.

It's beautiful to behold a Bullet Seed Multi-kill.

And let us speak not of Smeargle in these games.