What fast Pokemon could I use in the PWT?

Question

All my Pokemon are slow so I was wondering if there is any fast Pokemon
I could use.

Answer 1

Option 1: Metagross

So it's not "fast" at base speed 70, but it's got really good bulk and I like running an Agility set.
Metagross @ Expert Belt/ Leftovers
Ability: Clear Body
EVs: 196 HP, 252 Atk, 60 Speed
-Agility
-Ice Punch
-Meteor Mash
-Zen Headbutt

Option 2: Haxorus

Get that shiny one in the Nature Reserve. It's particularly good because you can soft reset for the correct ability/ nature/ good IVs.
Haxorus @ Lum Berry
Ability: Mold Breaker
EVs: 252 Atk, 252 Speed, 4 HP
-Dragon Dance
-Dragon Claw/ Outrage
-Earthquake
-Shadow Claw/ Low Kick

Option 3: Gengar

Good speed, high Sp. Atk and useful typing. Downfall is that it's not very useful in stalling anything due to poor defences.
Gengar @ Expert Belt/ Black Sludge
Ability: Levitate
EVs: 252 Sp. Atk, 252 Speed, 4 HP
-Shadow Ball
-Focus Blast
-Thunderbolt
-Disable/ Pain Split

Option 4: Starmie

The great benefit of having an instant recovery move, it also has really good speed (outspeeding Gengar) and good Sp. Atk.
Starmie @ Leftovers
Ability: Natural Cure
EVs: 252 Sp. Atk, 252 Speed, 4 HP
-Recover
-Surf/ Hydro Pump/ Scald (this depends on your team. Surf for anything with Storm Drain/ Water Absorb, Scald if you want the accuracy, or Hydro Pump if you want the power)
-Psyshock
-Ice Beam

Answer 2

You could use Ninjask which is the Pokemon which has the highest base speed of all non-legendary Pokemon. He also gets extra speed each turn because of his ability: Speed Boost.

Another good Pokemon to use would be Aerodactyl which is the Pokemon with the 4th highest base speed stat of all non-legendary Pokemon. It also has a high attack.

Alakazam is also a good option and it has the 9th highest base speed stat of all non-legendary Pokemon. It is also a good choice because it has a great special attack stat and can learn powerful psychic moves.

Source: Here