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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It was mostly a one time thing in Sonic Battle.
no
yes I can
get the combo cards from the sonic team building in emerls story.
You equip them as a ground power move and if you use them on an enemy it will kill them in 1.