Speed Boost
What the ability does
This Pokémon's Speed is boosted one stage at the end of each turn.
Who should get it
Speed Boost is a fantastic ability which ANY offensive Pokémon would welcome with open arms. However, there are some who would put this ability to especially good use: namely Pokémon who resist common priority attacks and have access to offensive stat boosting moves like Swords Dance and Nasty Plot. Imagine, if you would, a Speed Boost Scizor! Sure it loses that fantastic Technician boost on Bullet Punch, but now it doesn’t need priority attacks at all! Just use Swords Dance and let your ability take care of your speed on its own! Similarly, Slowking could set up an easy sweep with Nasty Plot and its impressive defenses.
Who actually gets it
Game Freak did a great job at teasing us here. They said, "Hey! Here's Yanmega, a fantastic special sweeper who gets this amazing ability!... but oh, wait, we also invented this move called Stealth Rock, which means Yanmega will only come in at half health every time, haha!!!”
Tinted Lens
What the ability does
When this Pokémon uses a move that is not very effective on its target, the damage is doubled.
Who should get it
Again, another incredible offensive ability here. It’s very hard to narrow down which Pokémon should get such a universally great ability, because anything with a high base attacking stat could make great use of this. Can you imagine if something like Heatran got this ability? Come in and fire off Fire Blasts without worrying about Swampert walling you. I think the one Pokémon who SHOULD get this ability, though, is Flygon; I mean, seriously, look at those eyes! He basically has tinted lens built into his DNA! Although Dragon is already only resisted by Steel-types, it would make Flygon that much better if he could just click Outrage without worrying about being setup bait for Agiligross or Skarmory.
Who actually gets it
Despite being 4x weak to Stealth Rock, this ability is actually what convinced people that Yanmega did not belong in UU! People slapped a Choice Specs on Yanmega, just clicked Bug Buzz, and were easily able to destroy most of the metagame. That should illustrate how good Tinted Lens is! Unfortunately, the other two Pokémon who get it are Illumise and Venomoth, so don't expect the phenomenon to repeat itself any time soon.