No, but some people classify it as an Uber. It depends mainly who you are battling with/against and where you are battling.
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Garchomp is not classified as a legendary but is very strong and IS classified as uber
uber-- arceus holding dragon plate, zekrom, reshiram, dialga, rayquaza,giratina overused- dragonite, salamence, garchomp, hydreigon, haxurous, kingdra.
No, Garchomp can't learn Fly.
in Pokemon an Uber is a legendary Pokemon.
grow it to level 49 and you got your Garchomp