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It's also important to note that using a shiny to breed DOES NOT increase the rate of hatching a shiny.

[Accessing an out of bounds Glitch City]

This is a variation, albeit less common, of a well-known glitch called 'Glitch City' which is when the overworld's tile set(s) are scrambled into a nonsensical and often times un-navigatable hodgepodge.

Basic information: https://glitchcity.info/wiki/Glitch_City

The most well-known is the 'wrong warp' variation in which you invert the Safari Zone so that you're entered into a session when you leave.
What you've triggered is the 'stepping out of bounds' variation:

An out of bounds Glitch City in Pokémon Red, Blue, Yellow is a type of Glitch City that appears when the y coordinate of a map is a certain value higher than its y boundary. It is not to be confused with a Generation II out of bounds Glitch City.

It can be contrasted with a Phantom City; which is a copy of a map that appears for excessively high x positions greater than the x boundary.

The required y coordinate for an out of bounds Glitch City may vary[clarification needed].

Like Glitch Cities accessed from a wrong warp, they are typically sourced from an existing map but with an invalid map block source pointer.

Accessing an out of bounds Glitch City
Use a free travel walk through walls glitch.
Go to either the north-west most or north-east most corner of a map (where y=00), then walk west or east. Alternatively, the glitch may work when y ranges between 01-06, with 06 placing you at position FE, 05 placing you at position FD, etc. The map you set up the glitch from must have a real east or west connection.
The y coordinate will be corrupted. Keep walking up to see a Glitch City.

https://glitchcity.info/wiki/Valid_source_map_Glitch_City#Through_stepping_out_of_bounds

Both 'Mewtwo Strikes Back' and 'Spell of the Unown' are my absolute favorites. Yeah my heart is forever stuck to the classics when it comes to the anime. I stopped watching it not far into Hoenn, it so killed it for me. I have not even but one of the films after 'Pokemon 4 Ever'. The one exception due to curiosity while staring at the box in Target, is 'Lucario and the Mystery of Mew', wonderful story and Lucario a fantastic in depth character with the classic feel of Mewtwo.

I never evolve Ivysaur into venusaur. I find Ivysaur really beautiful and Venusaur ugly, even the names.

I have this message on one of my Ruby cartridges(I have two) as well. It only means that you can't do activities which use time such as growing berries. In fact I think growing berries may even be the only one. The game still plays and saves perfectly.

Batteries eventually die, GSC ones did, unless you know how to open up the cartridge and insert a new one I don't think you can do anything, unless Nintendo still offer replacements. The DS games use the DS clock afaik, so they shouldn't ever have that problem.

Actually I was told by my guy friend who knows a lot about video games that GCS had a save battery glitch of some kind which was corrected in the advanced generations on. Thus I am not sure how capable the advanced generations are of that problem.