Steven gives you the HM containing Dive he lives in mossdeep city.
Tentacool, Relicanth.
Dive is not an HM in firered if you want a Pokemon to learn dive trade it to ruby, sapphire or emerald then take it back after teaching it the move.
Dive is not an HM available in Leafgreen. If you want to teach a pokemon Dive trade it to any of the Hoenn Region pokemon games (Ruby, Sapphire, Emerald) and use the HM Dive to teach the move and then you can trade it back. NOTE you cannot use Dive outside of battle just like Ruby, Sapphire, Emerald since it's not an HM instead it's a regular move that can be removed either by the Move Deleter or by teaching a different move.
Use the move dive to go underwater to find shards in the seaweed.
Since dive is not a HM in firered you will have to trade a Pokemon to a friend that has ruby, sapphire or emerald then using that game use the HM Dive to teach the move Dive to that Pokemon trade it back so firered can have that Pokemon again it will still have Dive however you cannot use it to dive underwater.
you cant go underground but you can go under water by using the move dive. you get dive in mossdeep city
most water Pokemon
Use Dive.
No, it is only available in Pokemon Ruby, Sapphire, Emerald, Black, and White. As just a move, yes, you can keep leveling up for Dive. It is mostly from Water type Pokemon.
it isn't in Pokemon platinum its in ruby and Sapphire
You can trade a Pokemon with the move dive from Pokemon Emerald, Ruby or Sapphire to HeartGold and SoulSilver and it will work.You can't, it's unobtainable.Dive is unobtainable in Pokemon Heart Gold Version and Pokemon Soul Silver Version as either a TM or HM. quote it is obtainable and to get it u need to go to the house near the battle frontier there be three dudes and one can teach u dive
You can't, You get dive from Steven in his house in Mossdeep.