StarOcean on 17 September 2015
The promise of Pokemon is what got me to get a 3DS. Like, just knowing it would eventually come out made me buy one, all the other 3DS games are just awful in comparison. What finally pushed me to get the 3DS was Super Mario 3D Land though.
For Wii U, it was Mario Maker and XCX. SMTxFE also peaked my interest. However my gf is the main reason I got the Wii U 
For Vita it was Persona 4: The Golden. That game is freaking amazing and made me buy the whole series afterward XD I also love Gravity Rush and Final Fantasy X HD
PS4 was Dragon Quest 11. It guaranteed that that'll be my next console purchase.
X1, if I had to go with anything, probably the Halo Master Chief Collection, that looks cool
