TL;DR: Noctowl is a very tanky generalist prestiger and it packs a punch against Snorlax.

Some long-time players may remember the times when Pidgeot with Wing Attack / Hurricane was considered the best commonly available prestiger. In particular it was excellent against Snorlax with Lick and/or Earthquake.

Then came Gen2 with the movesets overhaul, Pidgeot can’t learn Wing Attack anymore, Hurricane has been outclassed by other charge moves and Wing Attack has been slightly nerfed in both duration and power.

So let me introduce to you the new King of Flying Prestigers: Noctowl!

Noctowl’s typing is Normal/Flying, which makes it automatically resistant to Ghost (e.g. Lick), Grass (e.g. Solar Beam), Ground (e.g. Earthquake) and Bug moves, and only vulnerable to Electric, Rock and Ice.

Its best moveset, Wing Attack / Sky Attack, has a weave DPS of 21.7 (92% of the max possible neutral weave DPS) and it is neutral or Super Effective against everything but Electric, Rock and Steel.

But above all, Noctowl has the 8th-highest Defense x Stamina / Attack² ratio among Pokémon capable of reaching 1300 CP at level 30:

Rank #		Tanky prestiger	sqrt (D x S / A2)	Max CP (level 30)
1		Blissey	2.56	2765
2		Umbreon	1.69	1759
3		Steelix	1.49	2094
4		Jumpluff	1.43	1332
5		Hypno	1.31	1756
6		Lanturn	1.30	1764
7		Lapras	1.30	2232
8		Noctowl	1.29	1739
9		Dewgong	1.29	1624
10		Snorlax	1.29	2876

According to my CP efficiency calculator, here is the relative performance of Noctowl (in terms of combined time and revive efficiency) against some of the most common defenders gym sitters:

	Defender	Defending moveset	Noctowl performance		Benchmark
	Vaporeon	Water Gun / Water Pulse	57%		Tangela / Parasect
	Snorlax	Zen Headbutt / Body Slam	65%		Machamp
	Snorlax	Lick / Heavy Slam	70%		Poliwrath
	Snorlax	Lick / Earthquake	87%		Poliwrath
	Exeggutor	Confusion / Seed Bomb	60%		Scizor
	Dragonite	Steel Wing / Outrage	51%		Cloyster

These are already pretty good numbers, especially against Snorlax. If your main concern is prestige per revive, however, that is where Noctowl shows excellent performance:

	Defender	Defending moveset	Noctowl performance		Most resilient prestiger (excl. Chansey/Blissey)
	Vaporeon	Water Gun / Aqua Tail	68%		Kingdra
	Snorlax	Zen Headbutt / Body Slam	73%		Forretress
	Snorlax	Lick / Heavy Slam	81%		Lanturn
	Snorlax	Lick / Earthquake	99%		Umbreon
	Exeggutor	Confusion / Seed Bomb	78%		Skarmory
	Dragonite	Steel Wing / Outrage	74%		Steelix

These rankings are done with a 0%-70%-30% dodge setting, i.e. dodge only specials and more likely to dodge if using a non-Super-Effective fast move (because it doesn’t delay the “Defender used Charge Move” message).

Anyway, Wing Attack is fast enough to allow flexibility when dodging the defender’s fast moves, so the rankings are similar in a dodge-all scenario.

Complete moveset ranking:
1) Wing Attack / Sky Attack
2) Extrasensory / Sky Attack
3) Wing Attack / Psychic
4) Extrasensory / Psychic, Wing Attack / Night Shade
6) Extrasensory / Night Shade

Even if only #1 and maybe #2 are worth keeping, whenever I evolve a Noctowl I use it at least once in order to save a revive, just because of its tankiness.