you get it after beating tate and liza mosdeep city gym leaders and after defeating team magma in space center. Go to steven house in mosdeep city he will give you dive.
you can find dive balls at the mossdeep city pokemart
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
there's no hm dive in firered.so that means you can't find it.but you can find it in Pokemon ruby,sapphire,emerald and more.
you have to find the darkest patches of water to dive down in
get rayquaza
Dive underwater and find the team aqua base (if you beaten the psychic gym)
You get it after you beat the gym the go to steven’s house and dive is on the table
between route 134 and 133. find the dark spot to dive
Dive is not an HM in Pokemon firered or leafgreen however if you trade a Pokemon that knows dive from ruby or sapphire or emerald now you have a Pokemon that knows dive But you can't dive underwater in firered or leafgreen because it wasn't invented in the kanto region.
wailord you have to evole from wailmer and relican you find in dive mode.
go to Stevens house at mosdeep city i think it was?
You find them at the bottom of the ocean when you use dive, but there rare, so you won't find them very often.