You may have to wait depending on the Pokemon you want. I know for a fact that you need to wait 70 days for a Riolu in the Meadow.
Water objects draw out certain Pokemon from the safari zone. They are: puddle, fountain and water hole.
You get it on Mt. Silver or from the Safari Zone (Mountain) in the grass or with 5 Peak Objects.
When you put certain items in certain places, new Pokemon will appear.
Safari Zone, Mt. Silver
You can find Larvitar all over Mt. Silver and at the Day time in the Safari Zone mountain. The best Larvitar is placing 5 peak objects in the Safari Zone Mountain Zone. The Larvitar is level 42. This will evolve into Pupitar on it's next level up and into Tyranitar at level 55.
Water objects draw out certain Pokemon from the safari zone. They are: puddle, fountain and water hole.
In the Safari Zone (Meadow) with 10 Forest Objects and 14 Peak Objects after 70 days.
You can get a Larvitar from Mt. Silver or from the Safari Zone (Mountain) with 5 Peak Objects.
You get it on Mt. Silver or from the Safari Zone (Mountain) in the grass or with 5 Peak Objects.
When you put certain items in certain places, new Pokemon will appear.
Gible is in the Safari Zone (Rocky Beach) with 13 Plains objects and 17 Peak objects after waiting 100 days.
Skorupi is found the safari zone in Pokemon Diamond and Pearl.In HeartGold and SoulSilver they are found at the safari zone also.
i dont really know the peak objects
No.
You can get Lickitough in the Safari Zone.
down the street and to your left
safari zone