you get a everstone when you win 2nd place.
You can get every evolution stone by getting first place (or second for a few of the stones) in the bug catching contest in national park.
You can obtain a Shiny Stone by winning first place in Bug-Catching Contest. However, being first place in Bug-Catching Contest could land you with any stone.
The stones given to you as a first place winner are chosen at random. You have to beat the elite 4 then go to kanto and if you win a bug catching contest it will be random.If you come second you'll get a everstone
The bug contest is on Tuesdays, Thursdays & Saturdays
win first place in the bug catching contest
win it in bug catching contest or get it at the pokethlon place
Win 1st place in the bug catching contest.
The days that the Bug Catching Contest takes place every Tuesdays, Thursdays, and Saturdays.
there has to be a open contest then it will ask you to make a place to enter it in and there you go a second place
You could buy them at the Pokeathlon Dome Athlete Shop on Sundays (second page) for 3000 points, or you can win it as First Prize in the Bug-Catching Contest.
somewhere
You have to compete in a bug catching contest and win 1st place, for winning 1st place you receive a sun stone