Lavos Space

-This Pocket Dimension is created upon Lavos's landing on the planet.
-As do other Pocket Dimensions, PD-1's timeline runs "perpindicular" to the
outside world, evident in the same Lavos being accessible from all times.
-Lavos begins absorbing the planet's energy.
-Lavos surfaces this Pocket Dimension in the Ocean Palace in the Lavos and
Keystone timelines.
-Lavos is briefly summoned out of the Pocket Dimension by Magus in the Lavos
and Keystone timelines.
-Lavos leaves the Pocket Dimension in 1999 A.D. to destroy the world and
reproduce asexually in the Lavos timeline.
-Lavos is defeated by Crono's party, who enter the Pocket Dimension.
-Lavos's future within his Pocket Dimension is sent to the Darkness Beyond Time
and PD-1 is presumably destroyed.

From: Chronology