Standard Pokémon

In the course of team creation and synthesizing, some Pokémon with especially effective movesets have become commonplace. Some of these types are listed below.

Curselax
Snorlax@Mint Berry
Curse | Earthquake | Body Slam/Double-Edge/Return | Rest

Very commonly used Physical Sweeper. First, Curses up which lowers Speed while simultaneously raising Attack and Defense. Then uses Earthquake or the other physical attack to lay waste to the opponent. When it gets low on Health, it Rests. Repeat until nobody is left standing but him.

Death Starmie
Starmie@Miracle Berry
Thunder Wave | Confuse Ray | Surf | Recover

Parafusion paradise! Makes a great starter. First T-Wave, then Confusion, then Surf (which gets great STAB). Uses Recover when necessary.

Tyranitar@Scope Lens/Quick Claw/Leftovers
Earthquake | Rock Slide/Ancient Power | Crunch | Fireblast / Surf

Aside from being kinda slow, T-Tar makes a great Sweeper, Physical or Special (a little better at Physical). All the moves except one gets a big fat STAB bonus. Fireblast or Surf rounds out the moveset for one unstoppable killing machine.

Hitmonchan/lee/top@Mint Berry
Curse | HP Ghost | Mach Punch | Rest

Curse
takes all the HitMons already great Attack and takes it higher. HP Ghost is for any nasty Ghosts that may appear, and Mach Punch (which isn't the strongest move, but it always hits first and has plenty of PP) for everyone else. Rest refuels when it gets tired.

Machamp@Mint Berry
Cross Chop | Earthquake | Rock Slide | Rest

Three very powerful Attack moves which also include Critical Hit bonuses and Flinch potential. Capitalizes on its #3 highest ranking Attack power (only T-Tar and Dragonite is higher). Rest for healing, and this is one tough hombre.

Houndoom@Scope Lens/Kings Rock
Crunch | Flamethrower | Sunny Day | Solar Beam

Crunch
and Flamethrower both get STAB. Sunny Day plays a dual role of energizing Flamethrower and turning Solar Beam into a one-round attack instead of two. Top it off with Scope Lens for critical hits or Kings Rock for flinching, and this is an excellent Special Sweeper.