Crobat, the Bat (... ... ...) Pokemon. Over the course of evolution, as a result of its pursuit of faster yet more silent flight, a new set of wings grew on its hind legs. Having four wings allows it to fly more quickly and quietly so it can sneak up on prey without its noticing. This Pokémon rests by hanging on a tree branch with its rear legs. If this Pokémon is flying by fluttering only a pair of wings on either the forelegs or hind legs, it's proof that Crobat has been flying a long distance. It switches the wings it uses if it is tired. By alternately resting its front and rear wings, it can fly all day without having to stop.
Much as I'd love t' butcher a PotW Nick likes, my professionalism(????) drives me more than my urge t' troll. I'm not particularly a fan of Crobat nor it's pre-evolutions. It's design is very simple, very bland. 'Least it ain't so ****in' common as Zubat is... I'm very indifferent to it, as I am to most Pokes that have intentionally simple designs. 'Least it's not badly designed or fugly like a Golbat.
In the realm of competitive 'mons, Crobat has ranged from complete 'n utter shit to quite useful, depending on the Generation. Both Poison and Flying are very poor types overall for various reasons. This isn't helped by the fact Crobat's speed is it's sole asset. Back in Gen 2, it's movepool was pathetic. It had no particular strategy that it's speed helped with enough to make it useful. I take a direct quote from Smogon to summarize Crobat's Gen 2 UU career:
Originally Posted by Smogon
Gen 3 wasn't much kinder to Crobat, but it at least obtained some new tools. No longer UU trash, it jumped up to BL by taking advantage of a metagame it at least has some niche use in. With the introduction of abilities, Magneton was the bane of Crobat's bane: Steel types that are immune to Poison. Magnet Pull and powerful Electric STAB or a super effective Hidden Power offed any Steel type without a Shed Shell, and a Steel without Leftovers was bound to be worn down eventually anyways. With them out of the way, a weakened team could easily fall to a Crobat with a Choice Band. Since the Choice Scarf didn't exist back then, once your team was weak enough with any Steel types removed you wouldn't be able to outspeed the bat and prevent a late-game sweep. That was all it really had going for it though, besides a rather risky niche moveset which involves abusing Sleep Talk's negation of priority, Whirlwind and a team mate's layer(s) of Spikes.
Come Gen 4, Crobat gained absolutely ****-all and remained in UU: that is, until Platinum's move tutors came 'round and ****ed up the metagame somethin' good. It gained potent STAB in Brave Bird, a handy tool since Crobat needs all the power it can get. Tools like U-turn, Roost and Super Fang give it utilities to work with, allowing that blistering speed to finally be abused for something. Though it's Sp.A is quite low, Crobat is also the
fastest user of Nasty Plot in the game, bar Thundurus and it's damn priority gained through Prankster (and it's banned anyways). Physical Crobat is always expected, so when those Steel types switch in to tank a Brave Bird or laugh at Poison STAB, they eat a +2 Heat Wave instead. Though the lovely Scarf came 'round in Gen 4, just like Steel types it was simply a threat that simply needed to be removed. It wasn't the best at what it did, but that Speed is what set it apart from other Pokes. Despite an SR weakness, Crobat stood strong and was truly usable in OU for the first time.
Gen 5 is plastered with potent Fighting types, so you'd certainly think Crobat's 4x resistance to said type would be even handier than before. Quite true, but quite sadly that's where all the good news ends. Gen 5 OU is all about power as well as bulk. Crobat gained literally no tools from the generation transition. Pokemon are stronger and bulkier than ever, whereas Crobat still can't take a Stone Edge when it tries to switch in on a Fighting STAB move. It's usable in OU, but it certainly isn't much of a team player with an irrelevantly high Speed stat and poor typing. A "bulky" Crobat has competition better at the job, whereas a speedy Crobat can barely take resisted moves as is, none the less boosted neutral ones. Lets not forget that SR weakness either. At the very least, it does perform in UU as well as it did in Gen 4 OU.