i am having fun with this and stuff:
Base Stats: 70 HP / 85 Atk / 65 Def / 105 SpA / 85 SpD / 120 Spe
Sceptile's main use lies in its extremely high Speed stat, outspeeding threats like Starmie. It also boasts a decent Special Attack and usable Attack that it can use to punch holes in teams. Sceptile is also the fastest user of SubSeed other than the banned Shaymin-S, allowing it to wear down many top threats with the combination of Substitute to protect itself from Scarfers and priority. Access to Leaf Storm allows it to punch holes in anything that does not resist it, even more powerful when boosted by a Life Orb or Choice Specs. Dragon Pulse can hit Dragon-types that Sceptile lacks any other coverage for outside of Hidden Power Ice, with Focus Blast also viable to hit Steel-types that resist Sceptile's other moves. Hidden Power Fire normally rounds out the coverage, hitting Forretress for more damage than any of its other moves. A decent physical movepool and usable Attack stat, as well as access to Swords Dance, mean that Sceptile can run a decent Swords Dance set, with Leaf Blade as the main STAB and Earthquake + Rock Slide for pseudo-EdgeQuake coverage. Earthquake can be used to get a reliable hit on Heatran on special sets as well, particularly to take down variants that invest in Special Defense and/or HP. Overall, Sceptile has use simply because of its Speed and Special Attack: everything else is just icing on the cake.
Base Stats: 55 HP / 50 Atk / 45 Def / 135 SpA / 85 SpD / 120 Spe
Abilities: Synchronize / Inner Focus
Alakazam is perhaps blessed with the best combination of Speed and Special Attack in OU, outrunning many common threats due its 120 Speed and striking fear in the hearts of all but the bulkiest of special walls. Psychic alone of course does not have that great of coverage, but access to Focus Blast fixes much of this, hitting the common Tyranitar as well as Steel- and Dark-types for super effective damage. With such great coverage between just two moves, the other two moves are up-in-the-air. Substitute is almost always on Alakazam's moveset, protecting it from priority threatening to KO it. Since Substitute protects it from priority, Hidden Power Fire is often used to OHKO Scizor and Forretress. Signal Beam is used as an way to hit Psychic-types super effectively that resist the combination of Psychic + Focus Blast. It can even utilize Calm Mind and setup to boost its already frightening Special Attack, with access to Taunt, Encore, Recover, and Substitute making setup easier. Alakazam is also the fastest user of dual screens, getting them up quickly in the lead position to allow a frail sweeper like Lucario to setup. Anything that has a lot of power and Speed is always a large threat, and Alakazam is no different.
Base Stats: 160 HP / 110 Atk / 65 Def / 65 SpA / 110 SpD / 30 Spe
Abilities: Immunity / Thick Fat
Snorlax is most often seen utilizing Curse, perhaps being the best user in existence thanks to its high Attack, low Speed, and amazing special bulk. Access to Body Slam means that Snorlax can worry less about its low Speed with paralysis, also supporting the rest of the team if Snorlax cannot manage a sweep. Earthquake, Crunch, and Fire Punch are all great coverage moves, with Earthquake hitting Heatran, Rock-types, and non-levitating Ghost-types. Crunch hits all Ghost-types that resist Snorlax's STAB, and Fire Punch hits Skarmory, Forretress, Bronzong, and other Steel-types. Rest is always useful to keep Snorlax healthy as well. Selfdestruct is a powerful weapon in that it can OHKO literally anything that is not a Ghost-type, possibly taking a huge threat out with it. Pursuit can allow it to trap Ghost-types, best used with a Choice Band to hit as hard as possible. It can even use Swords Dance to become a more immediate offensive threat after one turn of setup. Unique in that in can wall and sweep at the same time, Snorlax is indeed a huge threat.
offensive Weavile, offensive Feraligatr, and offensive Yanmega are mine