There are two ways:
Trainer Battle:A fisherman on the the southn outskirts on Canlave I think he has a Lumineon I don't know.
Wild Battle:lumineon's are found in:Iron Island,Valley Windworks,Canlave City east,North,west and south outskirts and Sandgem Beach.
you find lumieon in the water in floweroma town the Pokemon that you have to use is butgresse
You can get the Pokemon in Sinnoh. If you go to Pokemon.com, you can see them.
on Pokemon pearl you only see 1
You need to get a chimchar in Pokemon pearl from the proffeser or trade.
Ho-oh is not wild in Pokemon Pearl.
Pokemon pearl
in the middle
you get it when you see every single Pokemon in Diamond or Pearl, then go and speak to proffeser rownan
put honey on a tree
You need to see all Pokemon in sinnoh
go to mt. coronet
Trade them with friends, but otherwise, the ones you can only get in pearl, like palkia, you can't see them. Unless you cheat, wich i wouldn't recommend.