Note: You can meet a trainer with a Gardevoir after you have beaten the Elite Four and given the VS. Seeker.
Psychic Abigail on Route 214
Ace Trainer Maya on Route 215
Ace Trainer Olivia on Route 217
Interviewers Roxy&Oli in Eterna City and Veilstone City
Psychic Bryce on Victory Road 1F
Ace Trainer Natasha in Stark Mountain Interior
Psychic Chesley in Stark Mountain Interior
Gardevoir isn't in Platinum as far as I know.
there are two trainers in stark mountain both of them have a gardevoir
There is a cameraman-and-reporter duo wanting to fight you in a Pokemon Center, and the reporter has a Gardevoir in Level mid-50's.
kirlia evolves into gardevoir at lv. 30
you cant get gardevoir but you can catch either ralts or kirlia and evolve it int gardevoir(ralts to kirlia to gardevoir to gallade
You can catch a Kirlia and evolve it into Gardevoir at Lv. 30.
Victory Road
The Gardevoir comic "Gardevoir's Embrace" was created by the artist known as Sour. It depicts a story involving a Gardevoir and a Trainer. Please note that this comic contains mature themes and may not be suitable for all audiences.
You can see Gardevoir by getting ralts then evolving it to kirlia at lvl 20 then to gardevoir at lvl 30
there is a trainer in victory road who has one. or you could go to the left of hearthome and catch a ralts then evolve. Hope i helped. if u have any more qs im Pokemon master231 You can do that, or you can transfer a Gardevoir from emerald, you have a better chance of getting a shiny one that way, ( it worked for me ^-^) or you can use your AR set up capture trainers Pokemon, and capture her Gardevoir. I like doing stuff like that. Or trade for one. I did so for a Milotic. by the way, the trainer's name in victory road is bryce. he is a psychic trainer and should be the guy under the bridge to a little left right when you walk into victory road. has a haunter, gengar, and that gardevoir you need to see
you can find the trainer with the misdreavus in platinum in hearthome city i believe
There is no trainer in platinum that is willing to trade a munchlax.