According to the Japanese retailer Sinobi Pokken Tournament might be coming to the Switch.
Source
It would make sense do to the arcade characters not being available on the Wii U and Nintendo seems to be getting into esports.
Serebii.net wrote:Earlier today, the Japanese retailer Sinobi listed a new arcade stick for the Nintendo Switch in their listings. In this listing, it mentioned that the stick can be used in fighting games such as Pokkén. They have since removed this note. It's currently unclear whether or not this was a mistake in listing something early or a mistake in the game not existing so it's currently unclear. Do note, this is currently classed as rumour and should not be taken as fact at this time. We'll bring any further details as they come
Source
It would make sense do to the arcade characters not being available on the Wii U and Nintendo seems to be getting into esports.