Yes you can get both Latias and Latios in Pokémon HeartGold however you'll need to have received an Enigma Stone key item from an official Nintendo event before you can find Latios in Pewter City directly outside of the museum and you will be able to come across Latias a roaming Pokémon that will only roam around the Kanto region but in order to get her to roam you will need to have exited the Pokémon Fan Club and talk with Steven Stone one of the Champions of the Hoenn region.
No, there are no underwater routes in Pokemon HeartGold or SoulSilver. The HM Dive is not available in Pokemon HeartGold or SoulSilver.
you cant catch persian in heartgold.... i think
YES=)
Yes you most definitely can
You need a Rotom as the first Pokemon in your team.
You can get lotad in the safari zone if you place the right items. to find out exactly how look at the pokemon marriland or serebii safari zone guide.
It evolves into Lombre at level 14 and then evolves into Ludicolo if you use a Water Stone on it.
safari zone
you migrate lotad from Pokemon emerald and ruby, and migrate it in pal park.
lotad evolves into lombre at lvl 14
where to catch lotad in Pokemon platinum i really need one to complete the national dex
in the safari zone (special items) OR transfer from sapphire, ruby, and emerald
The Pokemon Lotad, is a real Pokemon, that was introduced during the Hoenn Region, in the games Pokemon Ruby and Pokemon Sapphire, although it was an exclusive Pokemon only in Pokemon Sapphire, but was also made available in Pokemon Emerald. Lotad is a water and grass type Pokemon, also known as the Water Weed Pokemon, and evolves into Lombre, it's second evolutionary form, at level 14. Lombre then evolves into Lotad's final form, Ludicolo, when exposed to a Water Stone.
The early routes.
Lotad is #270 in the national pokedex, and it is a Water-Grass type Pokemon.
the lotad family: Ludicolo, Lombre, or Lotad. They are water/grass types
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!