Well, if I saw any WishBlisses on wi-fi that's tanking I'm pretty sure it's hacked though. WishBliss is INCREDIBLY rare, seeing as it was only given out once and that was over 5 years ago.
Yeah, that's one thing that people don't often take into account when considering competitive Pokemon: Simulators are only a simulation, and therefore do not accurately represent the current metagame situation of a wi-fi setting, where maybe 1 in every 1000 battles has a legitimate Wish Blissey, Leech Seed Vileplume, Level 50 Dragonite, etc.
On the topic of Bliss, I've had no problem using her in my practice so far. You have to make sure you have hard counters to the Pokemon who like to set up on her. My personal set is:
Katy Perry (Blissey) (F) @ Leftovers
Ability: Natural Cure
EVs: 60 HP/252 Def/196 SDef
Bold nature (+Def, -Atk)
- Wish
- Protect
- Counter
- Shadow Ball
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EV Spread maximizes useful bulk while making sure it has the defense to actually use Counter against opposing physical Pokemon.
You pretty much don't use it if you see a set-up Pokemon coming in, you switch instead and counter it. (ex. Hippowdon coming in on T-Tar and Lucario, Scarfmie coming in on Gyarados, Balloon Ninetales or Skarmory coming in on Doryuuzu, etc.)
Counter is for utility or coverage Pokemon who happen to have Physical
attacks and try to threaten you when you are weakened by using them. Shadow Ball has always been my preference to round out the Fighting/Ghost combo while also having a chance of lowering SpDef to make countering certain Pokemon easier, as well as harassing Celebi and Rotom, and now Victini and Shanderaa. The new Wish mechanics will make Wish/Protect even more ridiculously potent, so I think it's safe to say this Bliss and others in the metagame are here to stay, for now. In fact, stall might be even effective, if not plausible, depending on how the metagame develops...with old staples, such as this, being improved, and new Pokemon such as Bunungeru allowing us to counter things in ways that were not possible in 4th generation, you have to remember that Stall is being boosted just as offense is. Look for me to be rockin' the stall game all through 5th gen just I have through 3rd and 4th.