I finally had some time to look over it, but I’m not sure most of the dates are accurate tbh.. 
To go over each of them:
In the link it indeed mentions: “Lançamento de Pokémon Selva (Jungle em português) - 17h20 21/08/2000” (translates to “Release of Pokémon Selva (Jungle in Portuguese)”), but I don’t think the mentioned date is the actual release date. Mostly, because it also mentions the following “POKÉMON FÓSSIL, EM INGLÊS - 11h30 17/10/2000” (translates to “Pokémon Fossil, in English”):
And the English Fossil set is released on October 10th, 1999. So not sure what those dates signify, but I don’t think they’re release dates.
None of these sets were released in Portuguese a.f.a.i.k.
If I ctrl+F the date, I see this:
which translates to “The Ruby & Sapphire expansion for the Pokémon card game is now available in English. Learn More >>”
They mention the English translations, not the Portuguese ones. Following the link it goes to this page, with the first capture from September 22nd, 2003, but although it does mentions “Já chegou no Brasil a primeira coleção de Pokémon Estampas Ilustradas lançada pela Nintendo USA, a Ruby & Sapphire.” (translating to “The first Pokémon Trading Card Game collection released by Nintendo USA, Ruby & Sapphire, has arrived in Brazil.”), the links “lista completa da coleção, os decks e um preview dos cards.” all show English card texts and English pictures.
That’s very cool, thanks for sharing! 
This link also mentions the EX Sandstorm set is now available in English:
(translating to: “The Pokémon Ex Sandstorm expansion for the card game is now available in English. Learn about the new features, see the complete card list, and a preview.” and “03/11 - The Pokémon EX Sandstorm collection is now available in English! Learn more.”)
Again, none of these sets were released in Portuguese a.f.a.i.k.
I think you meant 21/12/2004 instead of 28/12/2004, but:
it also mentions “(em inglês)” (in English).
When I ctrl+F-ed for the date, I couldn’t find it. But ctrl+F for ‘emerald’ did give a very useful link (with different date). This page mentions an EX Emerald Launch tournament in Devir bookshops:
which translates to: “Last weekend, the official launch of the newest Pokémon-TCG expansion, EX Emerald, took place at the Devir Bookstore.”
EDIT: Nvm, I just realized the mentioned dates on Devir.com are the ‘current dates’ at the time of the archived WaybackMachine snapshot, not the days the articles were published.. 
See the explanation at the EX Deoxys part below.
So all we know is that the Portuguese EX Emerald set was released in a weekend in 2005, 2006, or 2007, and Rodrigo Hiratsuka won first place in that tournament..
Another pretty good source, since it indeed mentions the Portuguese EX Deoxys set and (circled in green):
which translates to “In August, the newest expansion for the Pokémon Trading Card Game EX, Deoxys, will be released entirely in Portuguese. And to celebrate, a super launch tournament will be held.”
I’m not sure where you have the 13 from (the article was written on October 13th, 2007 apparently:
Wait.. how can an article released in October mention an ‘upcoming’ release in August..
FFS, apparently the dates in the top-right of pages are just the current dates, not the actual published release dates..
Proof:
WaybackMachine snapshot of this page on October 13th, 2007, mentioning Saturday October 13th, 2007 in the top-left:
Snapshot of April 20th, 2010 mentions Tuesday April 20th, 2010 in the top-left of the page:
What a useless concept for a website with news articles..
Anyway, we still know the EX Deoxys set was released in August. Since the English EX Emerald set was released on May 9th, 2005, and the oldest snapshot is of October 13th, 2007, the Portuguese EX Emerald set is released in August of 2005, 2006, OR 2007. 
Well, at least we know the month, haha. Now we just need to know the year and day.
Just a month after the English release date of August 22nd, 2005 sounds very fast, but it could indeed be plausible, I guess. The picture of the English product worries me a bit, though:
I could be mistaken, but I think this was the release of the English EX Unseen Forces set within Brazilian stores, and the actual Portuguese EX Unseen Forces came later. This is just a guess however, mostly based on the following set with link you mentioned:
Here it also mentions a ‘Prerelease’ of the EX Delta Species set with a date and store locations:
But a.f.a.i.k. this set (with English release date October 31st, 2005) isn’t released in Portuguese, so I’m pretty sure they’re just talking about the English set becoming available within Brazilian stores. (Unless someone can find proof that the Delta Species set was in fact released in Portuguese as well?
)
Although it mentions “veja os cards em portugues” (translating to “view cards in Portuguese”), a.f.a.i.k. none of the sets in that screenshot, except for the Base, Jungle, and Fossils sets, were released in Portuguese.. The Gym Challenge, Gym Heroes, Legendary Collection, and Southern Island sets were in fact only available in English (and Japanese), and none of the other languages..
They’re likely talking about the translations for the online Pokémon TCG instead of physically released cards, similar the Russian Base Set translation that’s mentioned on Bulbapedia, I would assume.
Anyway, although most of the information turned out to be a dud, that is mostly Devir’s fault for not mentioning dates anywhere in their news articles, and only showing the current date on their pages for whatever random (and confusing) reason.. So still thanks for providing the links and trying your best in finding the information.
In conclusion of everything above: we at least know that:
- EX Deoxys was released in August (of 2005, 2006, OR 2007 )
- EX Emerald was released in a weekend between May 14th, 2005 (the English release date was Monday May 9th) and October 7th, 2007 (a week before the earliest snapshot). That certainly narrows it down, haha.
According to AI, there are 125 weekends between those two days. 
I’m kinda hating Devir’s website, ngl..
EDIT: I forgot I already had a partial source for EX Emerald, so we can narrow it down substantionally:
EX Emerald was therefore released near the end of 2005, prior to or on December 2nd, and in a weekend. Since December 2nd is a Friday (partially part of the weekend), I assume that’s it release date. Although it’s also plausible it’s the weekend before it (Saturday November 26th or Sunday November 27th, 2005).
And since we know EX Emerald was released in 2005 and came after EX Deoxys, we can now also narrow down EX Deoxys to August 2005.
Greetz,
Quuador