As you accumulate S-Ranks during your playthrough of thus game, you will start unlocking special EX stages at various points. These stages contain rarer, stronger Pokemon to catch and follow different rules than the main stages. (Defear the Pokemon in a certain time limit.) You can access these stages by tapping "Extra" on the lower left side of the touch screen. Tap "Main" to rerurn to the normal stage select screen. NOTE: Earning S-Ranks on the EX stages will not count towards your overall total.

Stage	How to unlock
Absol	Earn 5 S-Ranks.
Articuno	Earn 20 S-Ranks.
Blastoise	Earn 40 S-Ranks.
Blaziken	Earn 60 S-Ranks.
Charizard	Earn 45 S-Ranks.
Dragonite	Earn 50 S-Ranks.
Entei	Earn 70 S-Ranks.
Lucario	Earn 15 S-Ranks.
Moltres	Earn 30 S-Ranks.
Rotom	Earn 10 S-Ranks.
Sceptile	Earn 55 S-Ranks.
Swampert	Earn 65 S-Ranks.
Venusaur	Earn 35 S-Ranks.
Zapdos	Earn 25 S-Ranks.