- because Japan
- because it's an JRPG and therefore massively popular in Japan
- because SSB is overwhelmingly Japan-oriented
- because SSB has Fire Emblem characters. As in
more than one.
- because Tales has real time action oriented battles, visually in the realm of fighting games or beatemups
- because it has some history with Nintendo. Tales of Graces is originally a Wii game and was ported to PS3 a year later. Tales of Symphonia is originally a Gamecube game and is in fact Gamecube exclusive in the west. There are also apparently two Tales titles for DS.
- The first Tales game was on SNES. (I had no idea of this until I looked it up just now. But that's incredible.)
For the record I haven't played a single Tales game, but for
Sophie I would play them all.