I think the title makes the point pretty obvious. Anyway, another point to this is that there have been changes in the metagame in terms of usage. Lets look at the OU tier list: * Aerodactyl * Alakazam * Blaziken * Blissey * Breloom * Celebi * Charizard * Claydol * Donphan * Dragonite * Dugtrio * Dusclops * Exeggutor * Flygon * Forretress * Gardevoir * Gengar * Gyarados * Heracross * Jirachi * Jolteon * Ludicolo * Magneton * Marowak * Medicham * Metagross * Milotic * Moltres * Ninjask * Raikou * Regice * Regirock * Rhydon * Salamence * Sceptile * Skarmory * Slaking * Snorlax * Starmie * Steelix * Suicune * Swampert * Tauros * Tyranitar * Umbreon * Vaporeon * Venusaur * Weezing * Zapdos However, recent trends have shown that the most common OU pokemon (in order) are these: Blissey Snorlax Salamence Swampert Milotic Starmie Metagross Gengar Skarmory Blaziken Ninjask Marowak Regice Zapdos Flygon Tyranitar Forretress Dusclops Claydol Celebi Heracross Jirachi You'll notice that some previously common Pokemon, such as Jolteon are not on the list. This is because of the fact that they are becoming less common because of newer tactics and strategies. Pokemon like Regice and Ninjask are becoming more popular, while Blissey and Snorlax continue to dominate. However, a cursory list of Pokemon is not simply effective enough. Some previously common strategies have become less prevalent over time. For example, the CBmence and the Agiligross strategies are not used as much because people decided that the prevalent DDmence and more common CBgross were better, as they suit those Pokemon better. Also, the previously feared "Tyraniboah" has also been used less and DDtar is gaining usage in the current metagame environment. However, DDmence is still seen more, while DDGyarados is seen every so often. A note, though. Some Pokemon are making a comeback, including the excellent mixed sweeper, Blaziken. It is known as a common counter for the ever-popular SkarmBliss combo. This has caused the use of Skarmory to lessen somewhat, as even a switch to Blissey is not a safe move anymore. However, we can always simply say that those Pokemon are the most common OU pokemon. However, it would not be helpful enough to do that. What use is it without explaining how to counter them? Well, I will do that right now. Next to each name will be the name of the most common counters for each Pokemon. *Blissey- Blaziken, Metagross, Snorlax, Salamence, Gengar, Marowak, Tyranitar, Jirachi, Heracross, Flygon *Snorlax- Blaziken, Metagross, Snorlax, Salamence, Gengar, Milotic, Marowak, Tyranitar, Jirachi, Heracross *Salamence- Claydol, Suicune, Milotic, Salamence, Aerodactyl, Regice, Starmie, Marowak, Flygon *Swampert- Raikou, Sceptile, Celebi, Suicune, Zapdos, Gyarados *Milotic- Raikou, Regice, Sleeptalking Zapdos/Snorlax, Zapdos *Starmie- Raikou, Zapdos, Gengar, Dusclops, Snorlax, Blissey *Metagross- Blaziken, Metagross, Swampert, Salamence, Marowak, Claydol, Forretress *Gengar- Gengar, Snorlax, Dusclops, Raikou, Celebi, Jirachi, Metagross, Swampert, Jolteon, Blissey *Skarmory- Blaziken, Raikou, MAGNETON, Snorlax w/ Fire Blast, Claydol, Donphan, Armaldo, Forretress *Blaziken- Metagross, Suicune, Snorlax, Dusclops, Celebi, Jirachi, Swampert *Ninjask- Armaldo, Aerodactyl, Skarmory, Weezing, Medicham, Suicune, Arcanine *Marowak- Any Water type, Sceptile, Ludicolo, and anything faster that has a strong attack. *Regice- Medicham, Machamp, Blaziken, Swampert, Snorlax, Metagross, Marowak, Flygon, Tyranitar, Heracross, Jirachi *Zapdos- Metagross, Aerodactyl, Regice, Swampert (if Zapdos does not have HP Grass), Flygon (if Zapdos does not HP Ice), Salamence (if Zapdos does not have HP Ice) *Flygon- Milotic, Zapdos w/ HP ice, Regice, Swampert, Raikou w/ HP Ice *Tyranitar- Claydol, Swampert, Metagross, Aerodactyl, Salamence, Blaziken *Forretress- Blaziken, Houndoom, Magneton w/ HP Fire *Dusclops- Gengar w/ Shadow Ball, Snorlax w/ Shadow Ball, Suicune, Milotic, Skarmory, Houndoom, Tyranitar *Claydol- Milotic, Suicune, Gengar, Snorlax, Houndoom *Celebi- Forretress, Gengar, Snorlax, Houndoom, Suicune, Dusclops, Skarmory, Gyarados, Espeon, Alakazam, Celebi *Heracross- Salamence, Tyranitar, Gyarados, Zapdos, Dodrio, Skarmory, Weezing, Dusclops, Arcanine, Moltres *Jirachi- Moltres, Metagross, Salamence, Tyranitar, Dugtrio, Swampert, Steelix, Claydol, Snorlax, Blaziken Also, some Borderline Pokemon, such as Houndoom are being used a bit more, as Houndoom can counter Celebi and other Pokemon fairly easily with its diverse movepool. Another "BL" Pokemon that is seeing a bit more use is Cloyster, a good defensive wall that is unfortunatley weak to both Rock and Fighting, two fairly common types of physical attacks. It also has the ability to use Spikes, a strategy that is not used quite as much in current times. It can catch opponents off-guard, however, if used properly, since many people are not carrying Rapid Spin as much as they used to. However, besides all of that, using some of the less-used OU Pokemon can lead to a small advantage since opponents don't expect to see these Pokemon as much. A good example is Medicham. It has a few good uses. Here is a list of some its options: * CBcham * JaskCham * Endure/Reversal Medicham * Baton Pass Medicham * Bulk-Up Medicham All of those have their uses. CBcham makes an excellent starting Pokemon and can quickly take something out. JaskCham is the combination of Ninjask and Medicham, which can lead to a quick sweep. Endure/Reversal Medicham can be used as a last-ditch effort, but is easily foiled by Tyranitar. Baton Pass Medicham can be used to keep a Baton Pass chain going, but should watch out for phazers. Bulk-Up Medicham is a physical sweeper, as well, and can set up to sweep. While Medicham can use Calm Mind, that is not wholly recommended because of its weak Special Attack. Another Pokemon that deserves some more usage is Moltres. It has a fairly decent stat spread and has some good moveset options. The best are these two: Sunnybeaming Moltres and Sleeptalking Moltres. It could probably use Choice Band or be used in combination with Ninjask for some physical sweeping, but its weakness to Rock, Water, and Electric does not help it that much. As stated previously, using some of these less-used OU Pokemon can be good if the opponent does not know what to expect. However, no matter what happens, prediction is always key. If you can't predict, you'll never win. But this analysis will hopefully help you predict what Pokemon your opponent will use, and then it's up to you from there. edit- some spelling and grammar, etc.