From Bulbapedia, the community-driven Pokémon encyclopedia.
The 2011-12 Modified format (informally called HS-on) is a former Modified format used for the Trading Card Game's Play! Pokémon Organized Play division and in most sanctioned tournaments worldwide.
The 2011-12 Modified format was announced on April 26, 2010, featuring the rotation out of the last sets of the DP Series and the entire Platinum Series.
- North America and Europe: July 1, 2010 onwards
- 2011 National Championships
- 2011 World Championships
- 2011 Battle Roads Autumn
- 2011-2012 City Championships
- 2011-2012 State/Province/Territory Championships
- 2011-2012 Regional Championships (U.S. & Canada)
- 2012 Battle Roads Spring
- 2012 National Championships
- 2012 World Championships