No you cannot catch Larvitar in Pokémon Emerald.
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No you cannot catch Entei in Pokemon Emerald.
You can't catch a sentret in Ruby version, but you can catch one in Emerald version.
Tyranitar evolves from Pupitar, which evolves from Larvitar. You can get a wild Larvitar in Diamond at Route 207. It's impossible to catch a wild Larvitar in Pearl.
no but if you catch all the hoenn pokemon you can catch jotho and kanto pokemon
The Dragonscale is an item in Pokemon Emerald version. There is a chance that certain Pokemon such a Horsea will be holding one when you catch it.