There are two ways: when you catch pokémon, there will be selection to give a nickname or skip it. Here, you select yes, and you can nickname captured pokémon,
OR: Go to Slateport City. There is name rater between battle tent and Pokémon Fan Club. Talk to him, and you can give new nickname to your pokémon.
hi my name is nick and the master code for Pokemon Ruby is: 9E6AC862823AB7A8 46B7D9E4A709E9E1 Copy and paste into gameshark
latios is Pokemon number 197 in ruby
Pokemon Ruby Destiny Reign of Legends ,Pokemon Ruby Destiny Rescue Rangers, Pokemon Ruby Destiny Life of Guardians
#155 in Hoenn is Pichu.
in the slateport city u find a old man change nick in Pokemon
Pokemon ruby's version IS Pokemon ruby.
its just a nick name for her
In Slateport City, to the left of the Pokemon center.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
In slateport city
ruby
you can not change your own name without starting over