Unfortunately that's impossible now since in order to get ones such as Mew, Deoxys, Ho-Oh and Lugia - you'll either need to trade or cheat in order to get them - not to mention Celebi as well since their events are likely no more now due to the new generation of games so it's likely that if they ever come around for an event then it's likely it'll only be for the new generation of games.
No to get Cyndaquil you must catch all Pokemon from that region, because if you have to catch every single Pokemon, won't you already have Cyndaquil?
you cant
In every single Pokemon game and version, there are different Pokemon you can capture and train. In some games, you can catch one species of Pokemon, but not be able to catch it in another. In this case, surskit cannot be caught in emerald version, same with Roselia, while in sapphire and ruby, those Pokemon can be caught.
Yes. You can catch every single pokemon in the games.
You need to trade from every game.
hay even people how just started the game know all you have to have is oke balls AND YOU CATCH EVERY POKEMON YOU SEE AND YOU DONT HAVE that's how you catch every Pokemon
You can do bonus quests, such as go visit the Abandoned ship, catch all three Regi's Catch Rayquaza, Kyogre, Groudon, and complete your pokedex! ((P.S. if you catch every single Hoenn pokemon, Prof. Birch will call you on your pokenav and give yo a big reward!))
See or catch every Pokemon in the Hoenn (only the new ones)
Yes, also in heartgold, soulsilver and other versions as well.
Unfortunately, you have to catch, trade, or somehow own every Pokemon in the pokedex. If you had it at one time and traded it, it still is in your pokedex.
Emerl? If you mean Emerald, there is 387 that you can get by trading (complete the data for every single Pokemon exept sinnoh Pokemon) but idk how many just for emerald.
No im sorry, it is not possible. But if you look up where to find the Pokemon, then go to that area and catch them yourself. Every trainer has a Pokemon that you can catch, you just cant catch theirs. what kinda Pokemon watching freak r u!!!