Question

What Pokemon has the highest speed (without items, abilities, or natures)?

Comments

Deoxys has 180 base speed, which is the highest base speed.

Answer 1

A speed Deoxys that's level 100 with 31 IVs, 252 EVs, +6 stages, and tailwind has 3672 speed.
source

Answer 2

Deoxys, in its Speed Forme, is the fastest pokémon with a base stat of 180. In second is Ninjask with a base stat of 160.
3. Pheromosa with 151.
Soure: https://serebii.net/pokedex-sm/stat/speed.shtml

Comments

This is only by base stats though.

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But even with EV's and IV's won't change anything though.  Just the stat total, not which pokémon is the fastest.

Answer 3

If it’s restricted to the Galar Dex, then the fastest Pokémon is Ninjask, at 160 base speed.

Answer 4

Regieleki, at 200 Speed.

The next three are:

• Deoxys-S (180)
• Ninjask (160)
• Pheromosa (151)

Hope I helped!