http://www.vgchartz.com/gamedb/?name=&publisher=&platform=&genre=Role-Playing&minSales=0&results=200
It's pretty much the first entry after Pokemon in the most popular RPGs (if sales is any indicator), according to VGChartz data.
| Pos | Game | Platform | Year | Genre | Publisher | North America | Europe | Japan | Rest of World | Global |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Pokémon Red / Green / Blue Version | GB | 1996 | Role-Playing | Nintendo | 11.27 | 8.89 | 10.22 | 1.00 | 31.37 |
| 2 | Pokémon Gold / Silver Version | GB | 1999 | Role-Playing | Nintendo | 9.00 | 6.18 | 7.20 | 0.71 | 23.10 |
| 3 | Pokémon Diamond / Pearl Version | DS | 2006 | Role-Playing | Nintendo | 6.31 | 4.29 | 6.04 | 1.34 | 17.98 |
| 4 | Pokémon Ruby / Sapphire Version | GBA | 2002 | Role-Playing | Nintendo | 6.06 | 3.90 | 5.38 | 0.50 | 15.85 |
| 5 | Pokémon Yellow: Special Pikachu Edition | GB | 1998 | Role-Playing | Nintendo | 5.89 | 5.04 | 3.12 | 0.59 | 14.64 |
| 6 | Pokémon Black / White Version | DS | 2010 | Role-Playing | Nintendo | 4.96 | 2.58 | 5.57 | 0.83 | 13.94 |
| 7 | Pokémon Heart Gold / Soul Silver Version | DS | 2009 | Role-Playing | Nintendo | 4.09 | 2.49 | 3.96 | 0.74 | 11.28 |
| 8 | Pokémon FireRed / LeafGreen Version | GBA | 2004 | Role-Playing | Nintendo | 4.34 | 2.65 | 3.15 | 0.35 | 10.49 |
| 9 | Final Fantasy VII | PS | 1997 | Role-Playing | Sony Computer Entertainment | 3.01 | 2.47 | 3.28 | 0.96 | 9.72 |
| 10 | Final Fantasy X | PS2 | 2001 | Role-Playing | Sony Computer Entertainment | 2.91 | 2.07 | 2.73 | 0.33 | 8.05 |
| 11 | Final Fantasy VIII | PS | 1999 | Role-Playing | Square | 2.28 | 1.72 | 3.63 | 0.23 | 7.86 |
| 12 | Pokémon Platinum Version | DS | 2008 | Role-Playing | Nintendo | 2.67 | 1.58 | 2.69 | 0.52 | 7.46 |
| 13 | Pokémon Emerald Version | GBA | 2004 | Role-Playing | Nintendo | 2.57 | 1.58 | 2.06 | 0.21 | 6.41 |










Brawl sold 2.37M in Japan, Smash 64 sold 1.97M. I think with the help of FF VII IPs they can boost their Japan sales to 1.50M with proper branding and labelling. Now add to that the western appeal of these franchises, and the userbase of their respective games, and you have something that can not only attract the traditional Sony audience in the West, but a new casual audience worldwide, as well as a Square fanbase in Japan.
