the trainer is on the way to route 224.
In "Diamond," you can find a trainer in the Victory Road that will have a Whiscash.
A Pokemon guide that you can find in the forest.
in victory road
you can find gengar in victory road as you enter use rock climb and there i a physic train with it but in pearl and diamond fanita has it
you need a cheat that can catch a trainer's Pokemon to have lapras. because there is a trainer that has a lapras.
There is no such game as Pokemon dimond. There is one called Pokemon diamond though. Trainers are all around use the vs seeker in your bag or just go to victory road or elite 4 seriously, its not that hard to find a trainer
victory road
victory road
in Pokemon diamond go to iron island and find a camper trainer and fight her
The trainer in Victory Road
In Pokemon Diamond/Pearl, you find a old man at route 212 with a Leafeon.
you battle a Trainer and the trainer will say before you fight him EVERYONE