I don't really think you can. The thing is, in Sapphire you can catch Lotad but not Seedot and in Ruby you can catch Seedot but not Lotad. However in Emerald, you can catch both. So You'd have to trade from a Sapphire or Emerald.
Lotad can be found on route 114 on Pokemon RUBY!
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you migrate lotad from Pokemon emerald and ruby, and migrate it in pal park.
nowhere,you have to get a lotad or lombre from sapphire and, make lotad evolve to lombre and give a water stone to get ludicolo.
After obtaining the national Pokedex insert Pokemon Emerald/Ruby/Sapphire into your DS then you can find it on route 203 & 204
route 102
Mudkip, Marshtomp, Swampert, Zigzagoon, Linoone, Lotad, Lombre, etc.