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What new Pokemon are there?
I would like to know exactly what 50 Pokemon are new
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Shedinja, he'd have to be immune to all non-SE damage. Seems like the easiest to code.
For Kecleon they can just apply Ditto's type changing without the shapeshifting and stat changes, activated when the opponent uses a move that would be of a certain type. Probably would be the second easiest to code.
For Castform, they'll have to use the weather checker and make him change type, sprite and model. Might be the most difficult to code of the three.