Not much is known about PSII Palma. There's this excerpt from the manual:
PSII manual wrote:Closest to Algo is Palm, the economic and intellectual stronghold of the system. Thinkers and rulers live here, high in ivory towers, away from the
hubbub of everyday life.
Then again, the manual acts as if only Motavia has the history of Alis defeating Lassic to rid the planet of him.
In Phantasy Star II itself, Palma comes up several times. When Rolf volunteers to open the dams, what the Commander responds with suggests that the central government is indeed on Palma:
Commander wrote:Well..., but..., I'm sorry to say this, but the government of Palm has announced your names as the ones who made Mother Brain go crazy.
In the past, people from Palma came to Dezolis to mine laconia, according to this Dezolisian:
Dezolisian wrote:The Palm people came to Dezo to mine Laconia.
Tyler came from Palma:
Tyler wrote:I'm Tyler, a space pirate. I left Palm long ago; life under the Mother Brain was not to my liking.
The Espers came from Palma:
Dezolisian wrote:Long dern time ago, I heard that someone run away from Palm to this planet.
The other mentions in the game do not teach us anything relating to Palma.
In the Compendium, there's one timeline entry of interest:
Compendium wrote:The "Conjunction", the alignment of the three planets, occurs. Due to gravitational interference, the orbits of Parma and Motabia are shifted, and cities are annihilated. Thanks to the Earthmen, the escape shuttle containing the remaining members of the ruling class is destroyed, and the Landeel bloodline appears to be wiped out.