Yes, and a lot of them too. They're pricy, but I did get a few. EXPonential Growth and The Golden Gaffe were worth the five bucks I had on my EShop account, though.
Suitcune, No, never. Unless the server or my net are overloaded.
Not yet, but I plan to before it stops being free. I may also spring for a few extra dungeons when I get money on my debit card. From my experience, DLC is usually worth buying...or at least it was for Fire Emblem Awakening.
Of course, but it's still formidable. It kind of sucks when initially good Pokemon get trumped, though.
I considered it one of the best Attack/Speed-strong Pokemon until gen 5 and used it ALL the time in each of the trainer games. Its learned moves were also my faves until gen 5 too. But Mienshao stole my heart with better Attack and Speed stats and an improved Hi Jump Kick (the new 130 Power rating makes it an instant kill almost every time it connects). I'm not saying Zangoose is bad, just that it got too outclassed for my tastes in Gen 5.
I used to like Zangoose, but Mienshao killed it (and almost all Normal-types) for me forever. Its speed and power just can't match Mienshao's, so I just stopped using Zangoose.