not Pokemon rumble blast for 3ds. Pokemon rumble for wii.
This should help you
You get a ticket after releasing dialga, palkia, and giratina. After you do release them, bring the ticket to the red roofed building at the very bottom of the terminal. Source: http://bulbapedia.bulbagarden.net/wiki/Pok%C3%A9mon_Rumble
Mewtwo can only be obtain by releasing Giratina, Dialga, and Palkia Toys. Your best bet is to get to EX Mode and release them there for the best effect.
http://www.gamespot.com/pokemon-rumble/answers/how-do-i-get-mewto-palaki-dialga-and-giratina-131285/?edition=desktop
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