Who are these three well once on the top of Mt.Coronets You'll see Dialga and his mighty power's will be quelled by these three pokemon.Later on in the game or so you'll spot the three pokemon in a lake each and here are there desriptions:The yellow pokemon Uxie Lv.50 The blue pokemon Azelf Lv.50 and The pink pokemon Mesprit Lv.50 well I know what UR thinking there all the same way to catch ennnnnnnnnt! U.R wrong the last pokemon Mesprit once u talk to it, itll' flee but it in your map dont worry.[P.S there only there once soI suggest put to sleep,or paralye wellgood luck.