The DSi, XL, and 3DS ALL lack GBA Slots, making it even harder to get Pokemon from Gen III games transfered over. It's the very reason the Kanto and Hoenn Starters can be obtained in HG/SS, and why Mewtwo and the Legendary Birds were retconned to be found in HG/SS as well. Having to rely on old gens too much can cause issues when the very console itself does something to mess up such a pattern. The consoles itself is one of the reasons why R/S couldn't connect to the older games, other than the completely overhauled engine that is.
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Well in my opinion, I think they are neccasary.
You see heres my list from favorite to least favorite.
1.Kanto/Gen.1, you can get most Kanto Pokes in HG/SS, which are on DS,DSi,XL, and can be played on 3DS
2.Johto/Gen.2, HG/SS Both on DS,DSi,XL, and can be played on 3DS,Which you can get those Pokes too.
3.Sinnoh/Gen.4, This is also on the DS,DSi,XL, and can be played on 3DS,and Pokes ARE obtainable.
4.Unova/Gen.5,DS,DSi,XL, and DS,DSi,XL, and can be played on 3DS, The Pokes ARE obtainable.
5.Hoenn/Gen. 3, NOT on DS,DSi,XL, and can NOT be played on 3DS, BUT, Kyogre,Groudon ARE obtainable in HG/SS, some Pokes are found in Hg/Ss, B/W and PL/P/D. Most ARE found, as I completed my enitre National Dex, excluding lots of Hoenn Pokes, cause I dont use hacking devices, and I do not own a DS Lite/A copy of R/S/E/ anymore I am pretty much unable to completE the dex, Which is pretty much the object of the game. The only way is to trade with someone who does have them that imported them from the R/S/E. So yes, it is neccasary because the object of the game is to "CATCH EM' ALL!" Besides the fact, Hoenn does need a reboot, it would sell, Game Freak should definantly do this.
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130 of the Generation III Pokémon are available in HGSS alone. The only ones missing are Jirachi and Deoxys (which of course weren't normally obtainable in Generation III and wouldn't be in remakes) and the Regis, which were reserved for a movie event in Platinum. Since the Regis have hidden abilities now, they're bound to be made available in Generation V with or without remakes.
While the National Pokédex isn't a strong argument in favor or against remakes, it should be noted that the Generation II Pokémon had required multiple games before HGSS were released. HGSS have removed the dependence on the GBA versions for the Generation III Pokémon, as well, and the DS games will remain playable for years to come.
Replying soley to the OP,
In all honesty I think even before Masuda replied to that tweet it was pretty necessary for them to remake Ruby and Sapphire, since there's already that expectation of it stemming from FireRed and LeafGreen and the 2nd Gen remakes. The former were almost a necessity in the 3rde gen so one could theoretically fill up their Pokedex, plus it was the only way for you to get most Kanto and Johto Pokemon, even if you did have Pokemon XD or Colusseum. This is less so in HeartGold and SoulSilver, but it makes it much easier for you to get some Pokemon from that region onto Sinnoh cartridges, especially the cover legendaries. It's probably even less of a problem with these upcoming remakes since there's that potential for migration from games farther down the chain, not to mention that online trading is really starting to hit fruition, Dream World notwithstanding. Again, however, I think that they've definitely got something of a tradition now when it comes to this type of thing.
There was another big reason why, but I forgot what it was; if I remember I'll probably edit it in.

YES! because i have a DSi and they don't have the ability to play GBA games. i've never had a gameboy which means i've never played RS. I heard that they're both awesome and i also would love a cute little Torchic! XD
Yep. Having a Torchic follow you around in the region of Hoenn with B/W Graphics seems pretty awesome.
Three years or four from now, there might be a thread called: Issue #?: Are B/W Remakes Necessary? /random
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They are not necessary, but they will most likely remake them. A very big hint is the fact that Gen V's Dive Ball's function is to catch Pokémon easier while under water, even though you can't encounter anything under water in BW. Also, all the people talking about the Hoenn region in-game is a big hint, and there's a guy in the GF building who says: "We are remaking an old game, but it is quite a challenge." Also, as stated before by others, dive being an HM and blue and red striped Basculin are also possible hints. There are so many hints, I would be surprised if they wouldn't remake them!
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Everyone needs to realize that the "tradition" was broken with the introduction of Black 2 and White 2. Never before have we gotten sequels, so the "tradition" is no more. There is currently no need at all for remakes. The Hoenn starters are available in HG/SS and most of the Legendary Pokemon are as well. If Game Freak were planning on releasing R/S/E remakes soon, it would have made more sense to NOT include the Hoenn starters and Legends in HG/SS, making them even harder to find. That would then justify a remake of R/S/E.
That being said, I can see them releasing Ruby and Sapphire remakes later on...BUT only after the introduction of Generation 6 on the 3DS.
Just because a few people couldn't play the originals doesn't justify remaking them. If that is the case, they would have to remake EVERY game EVER just so everyone can play them, which they aren't going to do. Though, as someone who still has his copy of the original Pokemon Ruby, the games were definitely fun. And if you'd really like a Torchic, beat HG/SS. You can choose from the Hoenn starters once you do. (Or you could just trade with someone who already has beat those games.)
I think the "hints" are only hints that people decide are hints. The Dive Ball's description does NOT specifically say that it is to be used underwater, only that it is used "to catch Pokemon that LIVE underwater". Different terms, different meaning.
People also refer to Johto, Kanto, and Sinnoh in these games. And the GF guy talking about remakes is probably just a new aspect of game making that they wanted to add to the GF people.
The Basculin thing is only an opinion. And Dive is an HM because of its usage outside of battle. Moves don't have to be a HM for game changes.
My YouTube Vids (Pokémon White 2, Randomized Emerald and soon Platinum)
-Why don't use Pokémon who you like instead of powerful ones? You'll have fun in every battle and winning gives more satisfaction!
None of the moves you mentioned were ever HMs, and I believe Headbutt only works in HG/SS. But seeing as how it didn't have any purposes outside of R/S/E, it was probably made an HM just to show that diving had returned for B/W, not that it was mandatory for that to happen though.
In HG/SS, HM05 was Whirlpool, which was used in order to obtain Lugia. However, HM05 in D/P is De Fog and is in no way related to HG/SS. Going by your theory of Dive, Whirlpool should have been HM05 in Diamond and Pearl, but it wasn't an HM at all.
My YouTube Vids (Pokémon White 2, Randomized Emerald and soon Platinum)
-Why don't use Pokémon who you like instead of powerful ones? You'll have fun in every battle and winning gives more satisfaction!
Black and White have more references to Johto and Sinnoh than to Hoenn. The remake supporters are just being selective.
For the record, that NPC was referencing the development of HGSS themselves. He said "We are remaking an old game, but this is quite a challenge. Old fans would not want us to mess with their good memories... no point in just redoing the same thing, right? We are working toward something that brings back memories, yet is also completely new!" This is exactly how Game Freak described the making of HGSS in interviews and on their website. The in-game reference was just a way to break the fourth wall; the use of the present progressive in the sentence doesn't mean anything.And the GF guy talking about remakes is probably just a new aspect of game making that they wanted to add to the GF people.
Black and White make very limited use of HMs in general. If anything, this means that HMs are being phased out insofar as they may only be required at one or two points in a given game from now on.And Dive is an HM because of its usage outside of battle. Moves don't have to be a HM for game changes.
Of course. Maybe I should have been more clear. It seems that moves are made HMs if they involve reaching an area that is otherwise unable to be reached by simply walking there. That would make sense as to why De Fog and Flash are no longer HMs, since they don't totally prevent you from getting somewhere. Fly is just a handy and quicker method of travel.
That was one of the things that stuck out to me. Yes, they referenced Hoenn more in this game than in previous games, but no more so than they did the other regions.
I think the difference is that a lot of people play these games expecting and looking for hints along the way and jump to conclusions. They truly believe that there is a tradition, though the "tradition" has only held true once, so that's not enough evidence to go by. I've never played a game and thought they were leaving hints toward future games in them.

If they are to re-make Ruby and Sapphire, they should re-make FireRed and LeafGreen as well. For all the same reasons -- it can't be played on the newer DS systems and the compatibility between the GBA games and DS games is no longer there unless you have an older DS. And while Kanto is playable on the DS (through HeartGold / SoulSilver), the Sevii Islands aren't.
I don't think re-makes are needed. I think it would be great if they would port the games to the DS's Virtual Console (along with all the games for that matter) or even release a compilation DS card with all the old games on it, which wouldn't solve the compatiblity problem but it would at least make the games all playable.
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