You can not find a Gardevior on Emerald. You will have to find a Ralts in route 102 then evolve it into Kirlia at Level 20. Then into a Gardevior at level 30.
Wally, the true rival of Pokemon ruby, sapphire and emerald.
You must catch a Ralts Near petalburg city evolve it to Curlia and then at 36 i belive its gardevior
you can't find a gardevior in the wild
Gardevior psychic on tentacruel thunderbolt on the rest except whiscash use Breloom
Gardevior deflects projectile attacks, such as Samus's Missile, and throwable items, such as Pokéballs.
no it can`t evolve
Lopunny, Gardevior, and Medicham (i think gardevior should get together with team raider's gallade)
you get a girl ralts or kirila
You can't find a Dawnstone in Pokemon Emerald
go to the safari zone in emerald
when its level 19 trade it and let the one you have traded make it to lvl 20 and dont get your ralts anymore just let him or her level it into lvl 100 and said he or she must breed the gardevior that has a lot of good attacks and get the egg of gardevior and when it hatches to a ralts trade the ralts with a wurmple cause it has some good attacks rather than growl and level it into 20 for kirlia and 30 for gardevior if your using diamon pearl platinum to get gallad before you get a ralts in trade the ralts must hold a dawn stone and trade it so it will evolve into gallade(note:it only works on diamond pearl platinum )
You need to evolve a Ralts at level 20, and then evolve that Kirlia to level 30. You can find them on the northeren section of Route 212. Serebii.com is a good website for these sort of questions.