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Took me a bit to make this. To explain the multiple Rotom thing, basically the form depend on the starter you chose. The first time you encounter a Rotom form its the type that's weak to your starter, the second its the same type and up til the E4 it's the type that beats your starter.
For the full team, the rotom form depends on the day of the week. I'm not sure which rotom would go to which day, but regular rotom takes up both Saturday and Sunday.