To get the Ultimate Cards, you need to beat Virtual Training in Tails' Lab during Emerl's story.
You have to fight and unlock them, and there are no Sonic Battle cards outside of the game.
It was mostly a one time thing in Sonic Battle.
By battling really well, your chances are increased if your not hit, you can also go to Tails' Lab in Emerl's story to get ultimate moves and higher chances for rare cards.
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The smartest way to do this is get a very powerful skill card move. I would suggest sonic storm if you have that. Also, equip and Ultimate cards if that's possible. Nothing much I could sat but train hard.
Try mostplays.com
It's me Ishmael
yes I can
You get them randomly as skill cards at the end of a battle.
try sonicgames site.