You can't.
In every Pokemon game that i know of, the limit is always 6 and you would need to change the game coding for a different amount.
No, a SD card is not required to play Pokemon Alpha Sapphire. However, it is strongly recommended as extra content will require the use of an SD card
the best pokemon to use is mudkip.
ditto
You can get Lotad, Lombre, Sableye, Seviper and Lunatone.
use their Pokemon
There is no place to buy elixers in Pokemon Sapphire. You can, however, use your Itemfinder to search them out randomly.
You can use the Good Rod in Pokemon Sapphire to catch Pokemon. To get it, talk to a fisherman on Route 118.
There is only one pokemon you can use it on and that is eevee to get vaporeon
it will awake your Pokemon in battle if its a sleep
The sapphire is on Six Island. You need a Pokemon to use cut on the dotted door of the cave.
Use it on a Pokemon it will raise that Pokemon's special defense stat.
Combined with the sapphire the ruby and sapphire will allow you to trade with ruby and sapphire and emerald.