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I just played two quick pvp matches right now for the Delphoxite, and got a moon ball as a reward for the rank ups after the first battle, and 2 bottlecaps for the rank ups in the second, along with a lot of nuggets and rare candies/megashards.
I might have gotten extremely lucky with the rewards, but since I've played a lot of the first season and never saw anything like this (most wins at rank A rewarded a single mega shard), it's a good assumption grinding these is actually good now
