Overview: Taking a glance over Yanmega's stats, you'll see that it has high Special Attack, fairly decent Speed for LU, and great STAB options in Bug and Flying. Past that, you will also see that it has two amazing abilities in Tinted Lens and Speed Boost. Tinted Lens doubles the damage of Yanmega's moves if the opposing Pokémon resists the move, and Speed Boost allows it to outspeed the whole unboosted metagame at +1 and all Choice Scarf users at +2. Yanmega even has decent physical bulk, allowing it to come in on priority moves like Bullet Punch, Fake Out, and Mach Punch. With all these pluses going for it, one might ask why such an offensive threat would be in a tier like LU. The answer is simple: Stealth Rocks. With a 4x weakness to Stealth Rocks, it can only switch in twice if it takes no hits, severely limiting its use. This means that you will need a Rapid Spin or Defog user if you plan on making any use of Yanmega. It also has an incredibly low base 56 Special Defense stat. This means that common moves like Flamethrower, Ice Beam, and Thunderbolt will destroy it. Even with these crippling flaws, Yanmega is still a very large threat, and if unprepared for, it can do massive damage to your team. Choice Specs: Yanmega @ Choice Specs Trait: Tinted Lens EVs: 4 Def / 252 SAtk / 252 Spe Timid Nature (+Spd, -Atk) - Bug Buzz - Air Slash - Sleep Talk - U-turn With Choice Specs equipped, Yanmega's moves will be dealing a massive amount of damage to any Pokémon, while Tinted Lens allows all of its moves to do at least neutral damage to any resistances. The two primary moves on this set are Bug Buzz and Air Slash. Bug Buzz will be doing a large chunk of damage to anything that doesn’t have a heavy investment in Special Defense, and with the new mechanics of XY, Bug Buzz can even hit through Substitutes due to being a sound-based move. Air Slash is another powerful STAB move, allowing it to hit Fighting- and Bug-types harder than Bug Buzz would, while also having a 30% chance to flinch the opponent. The next two moves on the set are mostly filler; Sleep Talk is used to absorb moves like Spore and Sleep Powder, and U-turn is used to scout the opponent's move set and gain momentum. Modest can be used on this set rather than Timid, but because of Yanmega's Speed tier, which lets it outspeed Adamant Entei and Non-scarfed Krookodile, the extra Speed is almost always more useful. Life Orb: Yanmega @ Life Orb Trait: Speed Boost EVs: 4 Def / 252 SAtk / 252 Spe Modest Nature (+SAtk, -Atk) - Bug Buzz - Air Slash - Protect - Ancient Power / Hidden Power Ground / Giga Drain This set utilizes Yanmega's other ability: Speed Boost. With Speed Boost, Yanmega can raise its Speed at the end of every turn; allowing it to outspeed every unboosted Pokémon after one turn, and every Choice Scarf Pokémon at the end of two. The two primary moves on this set are the same as the Specs set, but the other two are different. Protect is used to gain a Speed boost, avoid Fake Out, and scout what move the opponent is planning on using, but it can be dangerous if the opponent predicts the Protect and switches out or boosts its Speed. Ancient Power is the main option for the last moveslot and is superior to Hidden Power Rock because of its 10% chance to raise every stat, while not giving up any IV's that would cause you to lose Speed Ties with other Yanmega. Hidden Power Ground can be used over it to hit Doublade and Nidoqueen harder, as they would otherwise live a Bug Buzz or Air Slash and retaliate with a STAB move. Giga Drain can be used to hit Ground and Water-types harder, while also gaining some HP for Yanmega in the process. Other Options: Outside of the moves listed on the sets, Yanmega doesn't have many other viable options. Hypnosis can be used to put an opposing Pokémon to sleep, but it will be missing out on some crucial coverage. Substitute and Roost are in the same boat; the former allows Yanmega to take one attack and absorb status, while the other allows for reliable recovery, but both will take up a moveslot, and Yanmega doesn't have any to spare. Checks and Counters: Stealth Rocks are the bane of Yanmega's existence, taking away 50% of its HP any time it switches in. Therefore, the best way to handle Yanmega is to keep Stealth Rocks up on the field, as that will severely limit its switch-in opportunities. Snorlax is able to take on both of Yanmega's sets, boasting the ability to not be 2HKOed by Bug Buzz, while being able to hit back with any of its moves to deal a ton of damage, Body Slam even having the chance to cripple Yanmega with paralysis. Registeel and Goodra are on the same boat, being able to handle both sets with their massive Special Defense stats, and being able to ruin Yanmega in their own ways, the former by utilising Thunder Wave, and the latter two destroying it with powerful moves. Escavalier checks Speed Boost Yanmega, but cannot switch into Choice Specs Yanmega or it will be two hit KO'd. Klefki and Doublade can take any hit from the Speed Boost set bar HP Ground and retaliate with Gyro Ball, or a priority Thunder Wave, crippling Yanmega. Faster Pokémon with super effective moves can handle the Specs set but not the Speed Boost set, because Yanmega will be able to outspeed them at +1. Some speedy Choice Scarf users can outspeed Yanmega even at +2 and OHKO back. These Pokémon check both sets unless Yanmega has already gotten a boost before you switch in the fast Scarfers. Bulky Water-types are a good answer to Yanmega, not being weak to any of the moves it carries and being able to take a hit or two.