In slateport city
he isn't in ruby/sapphire/emerald
latios is Pokemon number 197 in ruby
what pokemon?but if its in POKeMON Ruby its either in verdanturf or petalburg
At your moms house
Pokemon Ruby Destiny Reign of Legends ,Pokemon Ruby Destiny Rescue Rangers, Pokemon Ruby Destiny Life of Guardians
in petalburg city
in mossdeep city
route 110
at the faq house
in the cutter house in rustboro city
in a house in mauville city
not