Unlike the original Fire Red game, PokeMMO has Day and Night. Day starts at 6:00 and ends at 21:59. Night starts at 22:00 and ends at 5:59. You may check the time by typing, "/time" into the chat or looking at the Clock next to your Bag. Everybody should have the same ingame time. If your ingame time is different than others, contact a Support Moderator or other Staff Member immediately.
Day & Night Spawns
During the June 2013 update, initial Day/Night Pokemon cycles were implemented. Though all newly implemented Pokemon are found only at night, some original Pokemon such as Heracross can only be found during the day. During the Night Cycles, new Pokemon such as Relicanth, Chinchou, Gligar, and Lunatone can be found. Also, original Pokemon can be found in new locations. An example of this would be Zubat being available in tall grass at night.
Espeon & Umbreon
Eevee is currently the only Pokemon whose evolution depends on the time of day. Eevee will evolve into Espeon when it is leveled during the Day with 87% happiness. Under the same conditions, with the exception of it needing to be Night time, Eevee will evolve into Umbreon.
Note: If Eevee does not evolve when you level it with 87% happiness, you must relog and level it once. It is a known bug.