Well, I just checked it. It did sell better on the GC, but it didn't start on the PS2 (or was a PS exclusive in the past).
{1996-08-06} [SFC] Harvest Moon (Victor Interactive Software)
{1997-12-19} [NGB] Harvest Moon GB (Victor Interactive Software) - 27,421 / 137,207
{1999-02-05} [N64] Harvest Moon 64 (Victor Interactive Software) - 27,597 / 93,073
{1999-08-06} [NGB] Harvest Moon 2 (Victor Interactive Software) - - / 95,465
{1999-12-16} [PS1] Harvest Moon: Back To Nature (Victor Interactive Software) - 31,244 / 115,881
{2000-09-29} [NGB] Harvest Moon 3 (Victor Interactive Software) - 19,944 / 74,912
{2000-12-07} [PS1] Harvest Moon for Girl (Victor Interactive Software) - 6,139 / 6,139
{2001-07-05} [PS2] Harvest Moon: Save the Homeland (Victor Interactive Software) - 15,338 / 44,888
{2002-10-17} [PS2] Harvest Moon: Save the Homeland [Playstation 2 the Best] (Victor Interactive Software) - 3,026 / 6,414
{2003-04-18} [GBA] Harvest Moon: Friends of Mineral Town (Victor Interactive Software) - 20,050 / 161,430
{2003-09-12} [GCN] Harvest Moon: A Wonderful Life (Marvelous Entertainment) - 26,130 / 114,678
{2003-12-12} [GBA] Harvest Moon: More Friends of Mineral Town (Marvelous Entertainment) - 10,757 / 108,362
{2004-07-08} [GCN] Harvest Moon: Another Wonderful Life (Marvelous Entertainment) - 13,301 / 51,772
{2004-11-11} [PS2] Harvest Moon: A Wonderful Life (Marvelous Entertainment) - 15,889 / 38,706
{2005-03-03} [GCN] Harvest Moon: Shiawase no Uta (Marvelous Entertainment) - 19,394 / 70,673
{2005-03-17} [NDS] Harvest Moon DS (Marvelous Entertainment) - 22,026 / 107,136
{2005-11-02} [PS2] Harvest Moon: A Wonderful Life [Playstation 2 the Best] (Marvelous Entertainment) - 3,078 / 40,710
{2005-11-10} [GCN] Harvest Moon: Magical Melody (Marvelous Entertainment) - 3,603 / 6,912