yes.you can use ACTION REPLAY G.B.A,then put the ZAPDOS cheat on
No you cannot catch Entei in Pokemon Emerald.
No you cannot catch Larvitar in Pokémon Emerald.
You can't catch a sentret in Ruby version, but you can catch one in Emerald version.
no but if you catch all the hoenn pokemon you can catch jotho and kanto pokemon
You can't.You have to trade it from Pokemon Ruby Version
lilycove city
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.
You trade a Charizard of Pokemon leaf green version or firered version
You can't: you can only get it in a trade from a person with either Pokemon sapphire version or emerald version.
trade from emerald or colousum
You don't.
You cannot catch aipom in leafgreen however you can in emerald or Pokemon colosseum.