Just because some people had success with a Pokemon doesn't mean that that Pokemon is good, or in this case, a good Pokemon to use in the meta. I'm not saying slurpuff isn't a good poke to use in the meta. I'm just saying that it needs team support except on very rare occasions in which it can set up because of a misplay by the opponent.Or maybe you need a set-up sweeper that checks the shit out of hydreigon and fighting types? Slurpuff has a clearly defined niche in teambuilding and is very usable in uu.
http://replay.pokemonshowdown.com/smogtours-uu-18764
http://replay.pokemonshowdown.com/smogtours-uu-18764
Here's a couple replays of our co-tier leader sweeping chimpact with teams that aren't necessarily designed around slurpuff sweeps - they are complete teams which include slurpuff because its niche is useful to the team.
And by the way, both replays are of the same battle.