Red Flute
From PokéHeroes Wiki
A Red Flute is an item that doubles EXP/EHP increment of your Pokémon & Eggs for 7 days.
How to obtain them
They can be found and bought at the Item Shop for 100 Nuggets 
for Normal Users and 90 Nuggets for Premium Users, respectively.
How to use it
It can be blown and activated from your party page.
Other
- Red Flutes are not tradeable.
