That's normal. The perfect Mudkip at Level 30 is 841 CP
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Mudkipz is a pure water type. It gains ground type as Marshtomp / Swampert. So the bug was the ring on the map. He should not be boosted during sunny at all.
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Thanks, I was sure it is double type.
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evil mudkip 666
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You get a mudkip even on sunny days and I don't even get one on rain :(