A demo for Pokken Tournament DX will be released ahead of the game’s September launch. The game originally launched on the Wii U.
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The game officially launches a little under a month on September 20th. The Pokemon Twitter page made an announcement confirming a demo with a date of “coming soon” to the Nintendo eShop.
— Pokémon (@Pokemon) August 20, 2017
Perhaps the demo will showcase new content such as new fighters added to the roster. In comparison, the demo for Wii U consisted of single 1v1 matches.