Pokemon Roles

http://www.smogon.com/dp/articles/pokemon_dictionary
The definition are in there

E.g. :
Attacking lead: Mega lopunny(ou), Jirachi(ou), Machamp(uu)
Baton passer: Blaziken(ubers), Scolepede(ou)
Clerc: Clefable (ou), chansey(ou), sylveon(ou), vapourion(uu), Florges (uu), blissey (uu)
dedicated lead: deoxy-speed(uber), aerodactyl(uu)
duel screener: klefki(ou) azelf(uu) bronzong(ru) Uxie (ru)
Glass Cannon: deoxy-attack(ubers), gengar(ou), alakazam(ou), mega alakazam(ou), mega beedrill(uu)
Mixed Sweeper: Deoxy-attack(uber), garchomp(ou), infernape(uu),
Phazer / Pseudo-hazer / Shuffler: giratina(uber), lugia(uber), dragonite(ou), skarmory(ou), zygrade(bl), goodra(uu)
Pivot (Defensive / Offensive): genesect(uber), rotom all forms(wash-ou, heat-uu, mow-ru, others-nu), mega beedrill (uu), electross(ru), shedinja (pu)
Physical Sweeper: mega salamenc(uber), Garchomp(ou), Mega Charizard-X(ou), Mega Altaria(ou), hawlucha(bl), salamence(uu), feraligator(uu)
Rapid Spinner / Spinner: starmie(ou), excadrill(ou), donphan(uu)
Revenge Killer: latios(ou), alakazam(ou), scizor(ou), mamoswine(uu)
Special Sweeper: mewtwo(uber), thundorus(ou), keldeo(ou), porygon-z(uu)
Spinblocker: giratina(uber), gengar(ou), mega-sableye(ou),
Stallbreaker: Gliscor(ou), Mew(ou)
Status Absorber: Heatran(ou), Conkeldurr(ou), heracross(uu)
Suicide Lead: Deoxy-S(uber), Azelf(uu), Infernape(uu), Frozlass(BL2)
Supporter: Klefki(ou), Latias(ou), Chansey(ou), Blissey(uu), Florges(uu), Cressalia(uu)
Tank: Dialga(uber), Conkeldurr(ou), Garchomp(ou), Mega Aggron(uu), Mega Steelix(uu)
Trapper: Mega-gengar (uber), bisharp(ou), Tyranitar(ou), magnezone(ou), dugtrio(ru), Gothitelle(pu)
Utility Pokemon: Mega-Sableye(ou), Jirachi(ou), Mew(ou)
Utility Counter: Mega Diancie(ou), Bronzong(ru)
Wall: Lugia(uber), Chansey(ou), skarmory(ou), hippowdon(ou), blissey(uu), florges(uu)
Wallbreaker: Azumarill(ou), Mega-medicham(ou), staraptor(bl), victini(bl)

comment if you think something is wrong in here or if you want to put examples on here