you have to back yo jubilife city and head north into a cave and use rochsmash then just follow the route until you get to floraroma town from there you have to battle Mars, then you go through eterna forest and head into eterna city. (Spoiler, Cynthia will give you an egg that hatches into a togepi).
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in eterna city
He is in Eterna city next to Pokemon center!
In eterna city at the top of galactic tower in a pokeball
where can i find the second gym in Pokemon platinum
In eterna city he is a old man in an apartment building he claims he is a name rater select the Pokemon to rate the name then he asks you if you want to change it