No
get shaymin on your team and then the pikachu will disappear.
Mirage island
It should be impossible because shayminwas made in 2007 ruby was made in 2003 unless you can hack and make your own Pokemon than its completely impossible.
It is impossible to get shaymin in ruby version. Though, with using a gameshark or AR, which would be considered HACKING and totally against the rules of the game, you could get shaymin. But only by HACKING.
it is a item you can put in your secret base
In those indents, if you have a Pokemon that knows the move secret power, you can make your own secret location and decorate it.
Pokemon Ruby Destiny is a hacked version of Pokemon Ruby for GBA that is kind of like Pokemon Red Rescue Team.
Not really, but there is one to sky pillar
you must be getting it messed up with Pokemon ruby version. there is no secret slab in Pokemon mystery dungeon. at least in red or blue.
In Pokemon Ruby, the time changes do not affect which Pokemon can be caught. The time changes affect day-to-day things, which is basically challenging someone else in their secret base.
type what you want into Google - like a cheat for Pokemon ruby games