Suicine, Gardevoir and (of course) Pikachu have been confirmed as playable characters.
The footage shown in the Nico Nico stream looked much better than the original footage shown.
Lucario and Gardevoir mega evolve for big finisher moves. The mega evolution seems to persist for a little while afterwards.
Apparently some people spotted Hawlucha and Eevee as well, but it's not confirmed.
Snivy, Lapras, Fennekin and Emolga are confirmed as "Support" characters that can be brought into the match as an assist.
Looks like Gardevoir uses Shadow Ball as a finisher, Pikachu uses Volt Tackle, Suicine uses Sheer Cold. I'm unsure on Machamp and Lucario, but it looks like Lucario uses Aura Sphere.
EDIT: Gardevoir vs Pikachu fight
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