In the core series games
Generation V games, the Blue Flute can be sold to the billionaire maniac in Undella Town for 7000.
When used in the field or in battle, wakes a
When used in battle, wakes a sleeping Pokémon. (The Blue Flute can no longer be used outside of battle.)
Generation V and Pokémon X and Y
The Blue Flute serves no practical purpose other than to be sold.
Pokémon Omega Ruby and Alpha Sapphire
When used in the field or in battle, wakes a sleeping Pokémon.
R S E A glass flute that awakens sleeping Pokémon.
FR LG A blue glass flute that awakens a sleeping Pokémon.
XD A glass flute that awakens sleeping Pokémon.
D P Pt HG SS A blue flute made from blown glass. Its melody awakens a single Pokémon from sleep.
B W B2 W2 A toy flute made from blue glass. A maniac will buy it for a high price.
X Y A lovely toy flute to admire. It's made from blue glass.
S M US UM A flute made from blue glass that awakens sleeping Pokémon.
Acquisition In the anime Trivia
The Blue Flute (along with the Red Flute and Yellow Flute) was moved to the medicine pocket in Omega Ruby and Alpha Sapphire, meaning that it has been in three different bag pockets over three generations. In other languages