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I like your team, but you could've evolved your Tranquill into Unfezant. I'm finding it easy to balance my team too. My team is Dewott, Tranquill, Sawk, Whirlipede, Sandile and Archen.
I caught a shiny Gothita last night. I really wish that its shiny coloring was better because I don't see much of a difference between that and its original form.