try it again and if that doesnt work you need to catch every Pokemon
It means that that certain Pokemon had pokerus and is no longer able to get pokerus again
Some people will argue with me but i think the best place to train is at the Pokemon lugue you can battle them over and over again
you can only use Action replay or start the game again.
you can do about anything after you just cant beat the gym leaders again.
Beat the elite four again but they get stronger
Beat the Pokemon league again and go back to spear pillar and you will see dialga again.
you can't get him again.
You cannot
use your vs.seeker to get them to challenge you. they'll have better Pokemon though
Riley is a character in Pokemon. He is found in Diamond, Platinum and Pearl versions. http://pokemon.wikia.com/wiki/Riley
yes
NOPE!
no you can't
yes if you take the Pokemon league challenge again and again it will sure help
well... once you encounter a Pokemon, run, save, and turn off your DS. turn it on again. keep encountering the Pokemon and try it again and again till shiny...
try it again and if that doesnt work you need to catch every Pokemon