There are trainers all over the game
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There is a trainer in the solaceon cafe if you have battled him before you cant battle him but one of the guys in blue has it hope this helps
Once your at valor lakefront go east and enter sunnyshore city when you find the gym go in then... forward on to green button, down, left, up, green button through door blue, blue, blue, left stairs, trainer blue, green, right stairs forward red, left red, stairs trainer green green, blue right stairs red right stairs
While using the Trainer's Eyes feature within the PokeNav, the light at the left will blink blue if there is someone in the area who is available to re-battle.
haunter has to be traded to evlove haunter evolve into gengar in level 42
The strongest Pokemon trainer is definitely trainer Red from Pokemon Soul Silver/Heart Gold. All his pokemons are above level 80, way stronger than Steven from Emerald, and Blue from Pokemon Leaf Green/Fire Red. Amanzio from Pokemon White/Black wifi.