User blog comment:Diana8/Cure Ace/@comment-4831674-20130622192704/@comment-4831674-20130622193016

Others that I found:

Episode 22:  '''Appearing in a Pinch! The New Warrior, Cure Ace!''' (ピンチに登場！新たな戦士キュアエース！)  An angered King Jikochu sends Regina to Earth, where Mana takes her home. Thanks to all four Cures, Regina feels a warmth in her heart she never felt before.

Episode 24:  '''Shock! Mako-P Declares her Retirement!''' (衝撃！まこぴーアイドル引退宣言！)  Feeling that she has lost the meaning of her idol career due to the princess having been found, Makoto decides to retire, but is scolded by Ace.

Episode 25:  '''Brilliant Transformation! Appearance of a New Heroine?!''' (華麗な変身！ニューヒロイン登場！？)  Rosetta's powerful barrier is crushed by a Jikochu's intense attack. Ace arrives to help her, but her words make Rosetta suffer.

Episode 26:  '''My True Feelings? Rikka's Worries Once Again!''' (ホントの気持ちは？六花またまた悩む！)  As Rikka questions her dream of becoming a doctor, she comes across Ira at the beach.

But it seems that Ace "first appears" in 3 episodes? What do you think?