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It is very possible. I've done it once, but unfortunately, I never got a chance to go to any special events to get Mew, Lugia, Ho-oh, Celebi, Jirachi, Deoxys, or Manaphy, so it wasn't a true pokedex. If you can find special events where people are giving away each of the Pokemon listed, you could definitely do it.
What else can I help you with?
How do you get any Pokemon on Pokemon Pearl?
catch it
What do you do after you catch Mewtwo in Pokemon Pokemon LeafGreen?
Catch 'em all
Do you have to see all the Pokemon in emerald or catch them all to fill your pokedex?
YES!!!!!!!! all you have to do is see all the Pokemon and catch the ones you can catch in the game!!!
Pokemon emerald do you have to catch all Pokemon to get cydniguil?
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?
How do you catch all Pokemon in emerald?
if you don't have that Pokemon just catch it and evolve it
How do you get all Pokemon in Pokemon ruby?
CATCH THEM AND TRADE FROM SAPPHIRE
How can you get all Pokemon in sapphire without action reply?
You catch and evolve all of the Pokemon you catch :P
How can you have a stars in your trainer card in sapphire?
to get stars achieve the following: beat the elite 4, catch all the hoenn pokemon, catch all the johto pokemon, catch all the kanto pokemon.
Can you catch all of the Reggie's Pokemon in Pokemon white or diamond?
You can not catch any of them in black or white, but I think that you can catch all 3 in diamond.
Catch all Pokemon?
Yes, I do want to catch all Pokémon.
Who are all the Pokemon you can catch in Pokemon diamond?
you've gotta be crazy if you think someones gonna write all the Pokemon you can catch in diamond
Can you catch all the Pokemon in HeartGold?
yes you can catch every Pokemon ever made
