Beat the Pokemon league, then go to Pal Park. You must have a Pokemon that knows Surf.
You can't. Palkia is from Pokemon Pearl(Generation 4) and Pokemon Ruby is a Generation 3 game. You can transfer Pokemon from Ruby to Pearl/Diamond through the Pal Park, though.
if you mean can you get Pokemon from pearl and diamond and trade them to ruby so you can get diamond and pearl Pokemon on ruby. then no you can not. but you can migrate ruby Pokemon. you put the Pokemon in ruby that you want to put on diamond or pearl in the PC. save it turn off. then go to diamond and migrate them. must be in ds at the same time. pal park.
You cannot get a Gallade on Pokemon Ruby. But you may get one in Pokemon Diamond or Pokemon Pearl. - Badminton
the tiles are not in ruby/sapphire they are in pearl/diamond the tiles are not in ruby/sapphire they are in pearl/diamond
migrate from ruby
Yes
Electrike evolves into Manectric at Level 26 in Pokémon Ruby as well as in Pokémon Pearl.
You cannot get Regigigas for Pokemon Ruby since it is a newer generation of Pokemon. It is for Pokemon Diamond, Pearl and Platinum
Arceus is not possible to find in Pokemon Ruby. It was released in 2007 with Pokemon Diamond and Pearl
they go to the palpark.
migrate it from Pokemon emerald ruby or sapphire
you can migrate any you caught on ruby,