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Tail Glow raises the user's Special Attack by three stages. Stats can be raised to a maximum of +6 stages each. Assuming no other stat changes, the first use of Tail Glow would raise Defense to 2.5× normal value, and the second to 4× (the maximum level).
it says it raises special attack and then says it would raise defence
Thanks, another copy-paste error :/ (this time from Cotton Guard). Now fixed.