No, all you need is a Pokemon that knows surf, and a mach bike. You might want good Pokemon because there are a lot of high-leveled Pokemon.
There is no key it opens when you become a Pokemon champion.
select
where you use the key to turn on the quary.
To get to new mauville
Watson gives it to you
say thank you
As far as I know there is no code for key items.
Ruby & Sapphire Key
to recruit rayquaza u need a friend bow in mt faraway level 30 (need key to get it) its favorite gummy(sky gummy) lucario rank and lvl 100 poke and that's it hopee i helped go and get rayquaza :~) by. poke1234
there are lots of special places in emerald! the battle frontier, artistan cave (smeargle) , sealed chamber, island cave (regice) , desert underpass (ditto and the other fossil you did not collect) , mirage island (wynaut) , desert ruins (regirock) , ancient tomb (registeel) , sky pillar (rayquaza) , marine cave (kyogre) , terra cave (groudon) . Key: the names in brackets are the Pokemon that can befound there.
No they are not, braille and the unown are two different alphabet systems.
go to route 127 and 128,then go underwater.