I bet this has been stated before in the 28 pages of this thread at least once, but Shandera is only good with Shadow Tag. 145 Special attack? Nice, but Rampardos has 165 and it was NU last gen. Flash Fire Shandera is terrible. That's why Shandera ain't very popular in the wifi ladder. Shadow tag is what truly makes it good. Send it in on Nattorei, or Breloom, and that's one free kill for you. Generally when I fight Shandera, it only gets in one kill, which isn't too good for a sweeper. However, I won't deny the fact that it always kills one pokemon, usually a sweeper or something. It just can't do much off of it's 80 speed.
What's even worse is people making gimmick strategies with stat lowering and truant and calm mind and nitro charge. I fought this one guy who gave me Truant through Aianto, sent out Shandera, protected every other turn and calm minded to +6, then Nitro charging for 12 more turns. They kill my Medicham, and what's next? 1HKO by Aqua Jet from Azumarill. Then I pwn the rest of their team. Another example- the memento thing from Shandera's pre evos. Another pwnage, this time from Kurimugan Sucker Punch.
EDIT: There were Stealth Rocks up. Usually, Aqua jet does 75% or so to Shandera.