Hiya, you can only catch a seedot one way, and this is on pearl, diamond and platinum, (this method is not possible on the DSi and can only be done if you have Pokemon ruby) insert Pokemon ruby into the gba slot before you play pearl, and seedot will appear in routes 203, 204, 205 (north) and 212 (south), also found on route 212 (south) is nuzleaf, who also appears on route 229, good luck!
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Route 203 with Ruby in Slot 2
No you cant catch one alone with no other game but if you have ruby insert it into the ds with Pokemon pearl and go on Pokemon pearl and go to Route 203 or Route 204 after obtaining the national pokedex. (Rudy game inserted)
no you have to trade it from ruby sapphire or that other game.
you can find a seedot in route 102 in petalburg or oldale town which is lv. 2-4 or really rarely in route 114 in fallarbor town.
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!