The only, ONLY way you can get them is to have caught them in a gameboy Pokemon game and transfer them to your Pearl at Pal Park.
You can't. You must Migrate them from Pokemon Sappire, Ruby, or Emerald. or use AR (action replay)
no. Saphire is generation 3 and pearl is generation 4
You have to trade.
no
you can't get mewthree.MEWTHREE IS NOT A REAL POKEMON
go and catch them
most likely the 3 first Pokemon and starly
there is no way to capture latias and latios in Pokemon pearl except if you migrate them from other Generation 3.
493 3 r only by cheat codes
Go to the following websites for tons of Action Replay codes for Pokémon Pearl! http://us.codejunkies.com/search/codes/cheat_codes.aspx?selp=3&game=Pokemon-Pearl&gameID=17826135&page=0 http://us.codejunkies.com/search/codes/cheat_codes.aspx?selp=3&game=Pokemon-Pearl&gameID=17826135&page=1 Hope this helps!
Transfer it from a generation 3 game.
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.