Pokkén Tournament DX is an enhanced version of its predecessor on Wii U. With this, it adds a variety of new characters to its line-up. Some of these were in the arcade version but one was not.

Scizor

US Name: Scizor
Jp. Name: Hassam

Type: Bug/Steel
Style: Power

First Appearance: Pokémon Gold & Silver

Details:
Scizor was the one of the Pokémon revealed for the Arcade version of Pokkén Tournament and then added to this version.

Empoleon

US Name: Empoleon
Jp. Name: Empelt

Type: Water/Steel
Style: Standard

First Appearance: Pokémon Diamond & Pearl

Details:
Empoleon was the one of the Pokémon revealed for the Arcade version of Pokkén Tournament and then added to this version.

Croagunk

US Name: Croagunk
Jp. Name: Guregg

Type: Poison/Fighting
Style: Speed

First Appearance: Pokémon Diamond & Pearl

Details:
Croagunk was the last of the Pokémon revealed for the Arcade version of Pokkén Tournament and then added to this version.

Darkrai

US Name: Darkrai
Jp. Name: Darkrai

Type: Dark
Style: Technique

First Appearance: Pokémon Diamond & Pearl

Details:
Darkrai was the first of the extra Pokémon revealed for the Arcade version of Pokkén Tournament and then added to this version.

Decidueye

US Name: Decidueye
Jp. Name: Junaiper

Type: Grass/Ghost
Style: Standard

First Appearance: Pokémon Sun & Moon

Details:
Decidueye is the first Pokémon introduced for Pokkén Tournament DX that has yet to be in any previous Pokkén Tournament build.