No, Pokémon Crystal is a generation 2 game based in Johto and Kanto, whereas Pokémon Ruby is a generation 3 game based in Hoenn.
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The best and easiest way to get Pokemon from Johto in Pokemon Ruby is to trade them over from other games (Gold and Silver). Pokemon from Johto can be obtained in the same generation Pokemon Emerald after the player completes the National Pokedex.
If you flee from one of the Regis in Pokemon Ruby it will disappear from the game. This is the same for all Legendary Pokemon in all Pokemon games. The Roaming Legendary Pokemon are an exception as they can flee from battle without disappearing.
Pokemon Gold and Pokemon Crystal are very similar, but not the same. In Pokemon Crystal, you encounter the Legendary Beasts, Raikou, Entei, and Suicune, at the same time, but you only actually battle Suicune.
you get the ruby and the sapphire in 6 island and 1 island
you can get any Pokemon egg on ruby al long as you have a male and female of the same Pokemon in the day care center
Same as the gold and silver 251
Yes, you can breed with Pokemon from different regions, just as long as those Pokemon are in the same game at the same time. For example, you can breed a Pokemon FireRed Ditto with a Pokemon Ruby Mareep, just as long as the Ditto and Mareep are in the same region at the same time.
That's because they are two different games and the gameshark codes shouldn't be the same. roms are not legal and are a copywrite of Nintendo and gamefreaks work
No, You can only play mulitplayer against games of the same generation. So as Ruby is a GBA game, you can not play against the DS releases (Pearl, Sapphire and Diamond). ALthough, if you own a ds or ds lite you can use the gba slot in import the Pokemon from your gba Pokemon games into the ds games.
crystal does
Yes The "Set" of games are: Leave Green, Fire Red. Ruby, Sapphire, Emerald. And the old games, Red blue yellow crystal and gold. The DS ones are Diamond and Pearl. The Red rescue team and Blue Rescue team; I do not believe you can trade any Pokemon but possible items. You can help each other on Missions though i just don't understand how...