it means its evolving. when it evolves, its apperance changes. not only that but it gets stronger as it levels up & it can learn new attacks. evolving them is a great way to win battles w/ them.
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golbat can learn mean look
The circles in Pokemon Emerald are a form of marking and naming the users ' Pokemon. It allows the user to differentiate between Pokemon.
I'm sorry to say but you cannot get TM mean look on Pokemon emerald because it does not exist. Bye
Get a Golbat and train it.
If you mean all the Pokemon in the entire game, that's a little hard to answer. Be more specific.