Quote:
Originally posted by Cherry
Fly is definitely the best, especially now that you can fly to routes as of ORAS.
Surf is just prettier-looking tall grass and Waterfall is dumb. You have to clear 8 gyms for something you'll use 2-3 times tops 
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Both of the water moves are actually viable, and are carried by many mons competitively. The rest of the HM's, well, not so much.
As for their usage inside the game, if you never use fly it doesn't stop you from moving on in the game. So no.
I actually almost never carry a flying type with me, and just walk.