There isn't a trainer. you need to have Pokemon ruby. then after you get the national dex you insert ruby and go to route 208 and after a few encounters zangoose will appear.
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No trainer has zangoose in emerald.
you don't need a trainer,you can find one in the wild by fishing
A Pokemon guide that you can find in the forest.
you need a cheat that can catch a trainer's Pokemon to have lapras. because there is a trainer that has a lapras.
YOu find Reilley at Iron Island. You go really deep.