Torchic, treeko, and mudkip
a tepig\
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.
No, Parchirisu is a Pokemon that was introduced in Generation 4. It is not available in Pokemon Ruby (Generation 3)
You have to trade them from other games.
turtwig,chimchar,and piplup
In Pokemon Ruby there is the 3 regis, rayquaza, latios, groudon, deoxys, and jirachi. So there are 8 legendarys.
Palkia is not available in Ruby as it belongs to Generation 4 (Ruby is Generation 3)
Cyndiquil, Chikorita, and Totidile.
Somewhere. =3
torchic mudkip and treeco
Pokemon ruby's version IS Pokemon ruby.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.