Life Orb really doesn't need it's own set, because, like SDS said, it really is outclassed by Aerodactyl.
How does this make Life Orb Crobat less viable? There are cases in teambuilding when you need Crobat's 4Xs fighting resistance more than you need Aerodactyl's Fire resistance. I'm just pointing out LO Crobat can revenge kill with the same efficiency as Aerodactyl, it all depends on what OTHER roles it can fulfill to fit your team better. For example, things like Celebi, Breloom, and Shaymin are everywhere now, and LO Crobat you may want to revenge kill things AND be able to threaten those 3 pokemon. If your team needs that niche, why should the set be omitted? This is why some of us stress the "outclass" argument because while two pokemon may have a similar "role" they may have additional pros in cons to their use on said team.
