I'm going to be honest. Your quiz is far too diverse in terms of difficulty.
Question 1 is simply hard because we can't tell what you mean by the best 6 Pokemon aside from Legendaries. So what Chomp-O-Squirtle has said may well have been correct in his mind but not yours. I might come along and say that Aggron isn't and add Volcarona into the mix. It's matters of opinion rather than a question. So unless you're talking about the 6 best Pokemon in terms of overall stats, your question is preferentially biased.
Question 2 isn't specific enough. There have been many Wi-Fi Events that aren't Legendaries. By saying 'name me the the Wifi event Pokemon that isn't legendary' you're making it far too hard for anyone to guess because there is a list of them to go through.
Question 3 is a nice question. Something people will scratch their heads over for a bit and then they get the answer but not straight away. It's not difficult but not easy.
In my eyes your quiz should have questions like number 3. Then you'll be onto a winner.
Just wanted to point that out.
But now I'm going to attempt to do this quiz:
1. Slaking, Dragonite, Tyranitar, Salamence, Metagross, Garchomp.
2. No idea so I'm not going to even guess.
3. I'll name all 4: Fissure, Sheer Cold, Guillotine and the most commonly forgot about OHKO move: Horn Drill.
