It's in the Survival Area after beating the game, which is defeat Cynthia. Well it's the house beside the Pokemon Center. But you need a key or something to go there.
I don't know but in platinum you can go to a house beside the survival area with the gym leaders (even riley!) in it the gym leaders each day NOTE:Fighting everyone the means that the Pokemon league 15lvs higher on platinum.
it can just check it again and again maybe you set your clock wrongly
nope you will never see it again if you have KOed it and saved after you will need to start again or get it in a trade
well you cant the onlty way to is to start a newgame
you carnt you only get 1 per game inles you got an R4 or 999 games
you can do about anything after you just cant beat the gym leaders again.
you can't. but you can battle the gym leaders again by going to the house left of the Pokemon center in the survival area. Hope I helped.
Talk To Them and they May Battle You. But In Platinum, You go to Stark Mountain Do The Missions And then Well Go back to the survival Area And go in the building so Yeah.
If your playing Pokemon Diamond or Pearl, you'll never see him again, but if your playing Pokemon Platinum you can battle him and the gym leaders in the resturaunt in the Survival area.
from what i know, only in platinum
Beat the Pokemon league again and go back to spear pillar and you will see dialga again.
go to a city and find the gym leader's building.(some cities don't have gym leaders)
you can't get him again.
I don't know but in platinum you can go to a house beside the survival area with the gym leaders (even riley!) in it the gym leaders each day NOTE:Fighting everyone the means that the Pokemon league 15lvs higher on platinum.
No, unfortunately ;_; The only games that you can Re-Battle Gym Leaders on is Platinum, HeartGold, and SoulSilver
you can't. you can only fight the Pokemon league again.
Riley is a character in Pokemon. He is found in Diamond, Platinum and Pearl versions. http://pokemon.wikia.com/wiki/Riley