The answer is put Rilou into the poke'walker before you enter and then when you get in put Rilou back into your game.
In HeartGold/SoulSilver you can find a Ryhorn on Victory Road or in the Safari Zone. In the Safari Zone, it's in 'savannah' areas.
You can find a Jigglypuff in the Johto Safari Zone in Pokémon HeartGold and SoulSilver in the Meadow and Swamp areas of the Safari Zone.
In SoulSilver and HeartGold, use the Area Customizer to find the Peak Area in the Safari Zone.
In Pokemon HeartGold and SoulSilver, the safari zone is in Johto, past Cianwood City, past Routes 46 and 47.
To get hippopotas in heartgold and soulsilver you need to go to safari zone and use special items.
You can't catch one in SoulSilver. But you can catch it in HeartGold by the Safari Zone.
Obviously! I encountered one at Level 17 in the Safari Zone.
Growlithe cannot be found in Pokemon SoulSilver, not even in the Safari Zone. It can only be found in HeartGold.
You can catch Lairon in the Safari Zone, but you need to arrange the blocks and he'll most likely be in the Peak area in the Safari Zone.
You can find Lickitung on Route 44 or in the Safari Zone [Mountain Area]
The fastest way on HeartGold or SoulSilver would be to go into the Safari Zone and find it there.
it is on the east side of cianwod city HOPE THIS HELPS :-D