Everlasting Gem: Gem items are not consumed.
Users: Persian, Golduck, Vespiquen, Grumpig, some other Power Gem users, and a future Mega Starmie
Reloader: User does not need to recharge after using Hyper Beam, Giga Impact, etc.
Users: Mega Blastoise (Hydro Canon + Hyper Beam), Rhyperior (Rock Wrecker + Giga Impact)
Beacon: User and teammates offensive moves have a boosted 50% accuracy, as if being guided by a lighthouse.
Users: Mega Ampharos
Harmony: Sound moves have never miss accuracy, including sing.
Users: Jigglypuff line, Chatot. (intentionally weak pokemon)
Cranky: Instead of being put to sleep, Attack raises by one stage.
Users: Tyrantrum, Exploud, Watchog, lots of baby pokemon.
Digest: After fainting an opponent, user regains 1/3rd health.
Users: Swalot, Victreebel, Carnivine, Snorlax
(Disclaimer: No pokemon harmed in the process! :P )