There are indeed. One trainer is at Route 208; his name is Hiker Alexander. The other one is in the northern part of Route 210, and his name is Ace Trainer Ernest.
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Team Galactic and other Trainers.
yes grass type trainers do
Yes, near Hearthome City.
The only trainers that you will meet that hold items are trainers in Battle Frontier they only start holding items once you get later in the obstacle.
For Nosepass to evolve into a Probopass, it needs to level at Mt. Conoret, so you can't evolve them in HeartGold/SoulSilver, you'll have to trade it to Pearl/Diamond/Platinum.