the vast majority of water type pokemon, excluding magikarp and i think feebas. If you have something that knows surf, odds are it can learn dive
Chat with our AI personalities
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 get the abilty to use the move Dive from Tate and Liza in Mossdeep and then you can teach your Pokemon to Dive! X3 POKEMON-1001
No. Dive is an HM in kanto, so you can't use it out of battle. Some Pokemon can learn dive with no Tms or HMs, but you can't use it as a field move.
In Pokémon Ruby, Sapphire and Emerald, teach a Pokémon the HM move dive and once you're surfing over a dark patch of water, you can use dive to go and stay underwater.
all water Pokemon at least