If you search in the codes of Ruby & Sapphire, you can find music from Generation 2 (Gold, Silver, Crystal). Known pieces include:
- BGM from Route 38 & 39
- BGM from Pokemon Communication Center
- BGM from Generation 2 Saffron City
- BGM from Crystal’s legendary beasts battles
- Team Rocket’s Theme
Is unknown why these music tracks were put in it. Maybe it was for being able to go to Johto or even Kanto, or just stand-ins.
There was also two beta Pokemons: Shellos & Gastrodon. If you’ve played Pokemon Diamond/Pearl you sure know which these are, and they were actually going to be included in Ruby & Sapphire. Shellos & Gastrodon though were not supposed to look like they did in Diamond/Pearl. This how they were going to look like:

Shellos‘s beta back sprite

Gastrodon‘s beta back sprite
For more infos: Bulbapedia
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(3 votes, average: 4.33 out of 5)![Pokemon Ruby & Sapphire [GBA – Beta / Unused Sprite] Pokemon Ruby & Sapphire [GBA – Beta / Unused Sprite]](https://www.unseen64.net/wp-content/uploads/2008/05/pokemonrubyagbalogo.jpg)
![Pokemon Emerald [GBA – Beta / Unused] Pokemon Emerald [GBA – Beta / Unused]](https://www.unseen64.net/wp-content/uploads/2010/08/pokemon-emerald-glitch.jpg)
![Pokemon Platinum [DS – Beta / Unused Stuff] Pokemon Platinum [DS – Beta / Unused Stuff]](https://www.unseen64.net/wp-content/uploads/2008/12/giratinabeta.jpg)

can you get me the beta pokemon ruby
this is the beta for ALL