this is kinda tricky to do but basically you do a kikoken and as soon as you press H press H again. the timing is a bit tricky but once you pull it off you can wait a bit to land the tenshokyaku shortly after because of the huge stun.
Also another note i found it a lot easier to perform on a fight stick. but its pretty much the same thing
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The Kikoaken (気功暗拳 Kikou'anken, "Qigong Shade Fist") is a move Chun-Li was given in the Marvel...