Wow, this is sad. Complaining about designs you don't like, bad type combos (grass/bug) and overused type combos (fire/fighting) and type combos not being used yet (grass/fire) are one thing and perfectly justified.
But complaining about a unique type that hasn't been done?! I cannot believe that people are complaining about a pure flying type. W-T-F IS WRONG WITH YOU PEOPLE?! HOW IS A PURE FLYING TYPE BAD? WHY SHOULDN'T A PURE FLYING TYPE EXIST?! Ugh. And other say it makes no sense. The only thing that makes no sense is that people are complaining about something that HASN'T BEEN DONE YET. Wow, it hasn't been done before, that means it never should? Some people are way too narrow minded. I remember others once saying fighting/dark could "never" be done along with grass/fire and grass/ice. *sigh*
On the other hand, anyone who thinks the pure flying type is wasted on the design, I can understand that complaint. Like Manhatten said, it makes no sense why they made 3 pokemon that look exactly the same with palette swaps and slight reskins yet only one of them is a pure type.
Oh, and the lake trio SUCK. The difference between the clone trios is that the flying trio actually look interesting despite being exactly the same, instead of cutsey.