Ralts evolves at level 16 or 18 to kirlia then you can use a dawn stone to turn it into a gallade (only if it is male) or level it to 30 and it will evolve into gardevoir.
you can migrate from saphire, or you can catch a ralts in the safari zone and evolve it
You could find swarms of ralts on route 34 on the right day if you're lucky and then evolve it at level 20 or just trade for one somewhere
Evolve a Kirlia at level 30 for Gardevoir. You can find Ralts swarming on Route 34.
Ralts evolves at level 20
kirlia is not available in the wild. you would have to catch a male or female ralts during a mass outbreak, and evolve it into a kirlia.
20
You must first evolve Ralts into Kirlia and then you must use a Dawn Stone to make it evolve into Gallade.
at lv 20 that is when ralts evolves
evolve ralts into kirlia[male]and use a dawn stone hope this helps
Ralts is a swarming Pokemon at Route 34. You can also trade or transfer a Ralts from another game.
level up Ralts to 20 let it evolve then and then 30 to Gardevoir. I find it easier if yo let ralts level up to 29(better if you have an everstone) let it evolve then to 30.
Ralts evolves into Kirlia at level 21. Hope I helped.