i looked on serebi.net and it says
"The Trees in Azalea Town, Lake of Rage, Ilex Forest, Routes 26, 27, 34, 35, 36, 37, 38, 39 (Use TM02, Headbutt)"
so that means both day and night...
Join this site...http://s14.invisionfree.com/ChaoticRoleplayRealm/index.php?
and this one...http://gameknot.com/?rfr=diezombie...when you sign up the second one, where it says referals by, type in diezombie