welcome back wolf pack verlis here
Unranked --> C
Nah, seriously, this thing isn't half bad anymore. It was pretty ass in XY because it's best coverage for a Belly Drum set was Fairy/Normal, but adding Drain Punch into the mix really does help its viability, giving it a great coverage move and a way to restore its health to possibly take another hit. Unlike Azumarill, it doesn't have priority, which can get kind of annoying, however, Unburden boosts Slurpuff's speed after a Belly Drum so it can actually reliably use its most powerful attack. The reasons this isn't as good as Azumarill are that it's harder to set up and it's complete dead weight without a Belly Drum; Azumarill at least has Huge Power going for it. It's definitely a Pokemon that's worth a shot now, though, and you should try it out if you haven't already.