Phantasy Star Portable debuted at the top of the Japanese charts with a
surprisingly huge number this week, around 340,000 copies. The PSP on the top
of the charts with 61,181 units sold while the DSlite comes dangerously close
with 57,398 units sold.That’s the fourth best start for a PSP game after Monster
Hunter Portable 2nd G, Monster Hunter Portable 2nd and Crisis Core: Final Fantasy VII.

Hardware sales for the week of July 28th – August 3rd:

PSP — 61,181
DS Lite — 57,398
Wii — 41,109
PS3 — 9,508
PS2 — 9,045
Xbox 360 — 5,359

Software sales for the week of July 28th – August 3rd:

Phantasy Star Portable (PSP) — 341,700
Rhythm Tengoku Gold (DS) — 212,877
Dragon Quest V: Tenkuu no Hanayome (DS) — 111,836
Soulcalibur IV (PS3) — 74,607
Jikkyou Powerful Pro Yakyuu (PS2) — 37,106
Soulcalibur IV (360) — 34,786
Rei: Tsukihami no Kamen (Wii) — 33,456
Wii Fit (Wii)– 32,201
Mario Kart Wii (Wii) — 23,143
Gundam Battle Universe (PSP) — 20,856

Source.