Hey, I have a few suggestions for 3 of the current analyses in NU.
Duosion: Thunder should be mentioned in the AC of the first set, or at least OO. Thunder is a lot stronger than HP Fighting and allows you to get neutral coverage on both Dark and Psychic-types at the same time. It also has a 30% chance of paralysis, and a Pokemon needs about 400 Speed or more to outspeed Duosion after they're paralyzed. Only problem is the terrible accuracy, but Duosion can afford the occasional miss.
Slaking: Retaliate should be moved to the last slot. Yeah, you will only use this after something dies, however, that extra power is really useful for threats such as Tangela and Weezing. The moves currently in the last slot, Focus Punch and Pursuit, are moves you'd rarely ever use on Slaking. Focus Punch is nice for hitting Regirock, but you still don't OHKO 252 HP Regirock. There are barely any Ghost-types in NU to hit with Pursuit, and you'd usually want to just hit the switch-in hard, however Pursuit does have its moments where it is useful as it can still trap weakened Pokemon... although if you have a weakened Pokemon you'd probably just want to sac it to Slaking. Pursuit could maybe get a slash in with Retaliate.
The checks and counters section in Slaking could use some work too. 1) it should probably mention Armaldo. Armaldo resists Slaking's STAB and also doesn't take that much from Earthquake. 2) It mentions Tangela healing with Synthesis -- the Tangela analysis doesn't even list Synthesis. (However, it should; it's still not one of the best options you can run on Tangela, though.) 3) Maybe have a mention of saccing something to Slaking and then abusing its Traunt turn by setting-up?
Tangela: Synthesis in OO? It's not the best option, as Tangela already has Regenerator, but it makes it even harder to kill and with Synthesis it doesn't have to switch-out every time it's at low health.