How many Expert Stages are there and how are they Unlocked?

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I've been playing Pokemon Shuffle for a while and I've gotten up to to Expert Stage 19 (Yveltal) and I've gotten an S rank on many of the main stages up to 190.
I know there are more Expert Stages to unlock, but what are the requirements?
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How many Expert Stages are there in Pokemon shuffle?
6) there are 24 Expert Stages, those you are missing are Mewtwo, Genesect, Chesnaught, Delphox and Greninja. Here below you can see which Expert Levels you haven't unlocked yet.How do you unlock the UX stages in Pokemon shuffle?
UX Stages are a set of stages almost identical to the Main Stages. They are unlocked after clearing Stage 700: Primal Kyogre and achieving 500 S-Ranks.How do you get S rank in Pokemon shuffle?
Each stage has its own rules for determining ranks, but here are some rough estimates that apply to most Main Stages: S-Rank: At least 1/2 of remaining moves/seconds left, rounded down. A-Rank: At least 1/4 of remaining moves/seconds left, rounded down. B-Rank: At least 1 move/second left.HOW TO GET SSS RANK IN RESIDENT EVIL VILLAGE MERCENARIES (UNLOCK LIGHTSABER)
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Images: PNW Production, Dayvison de Oliveira Silva, Dayvison de Oliveira Silva, Felipe Hueb