After beating tate and liza head to steven's house in mossdeep city he will give you the HM Dive.
it isn't in Pokemon platinum its in ruby and Sapphire
You cannot get HM Dive in Pokémon LeafGreen.Since Dive is not an HM in leafgreen the only way to get one of your Pokemon to learn Dive is to trade it to ruby, sapphire or emerald then teach it Dive using the HM then trade it back to leafgreen.
talk with steven in the MOSSDEEP
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.
Dive is not an HM in leafgreen however some Pokemon can learn it on there own, if you want to have a Pokemon with dive have the Pokemon that you want learn dive in ruby or sapphire or emerald then have them trade you it and now you can use dive but not outside of battle because its not an HM.
at Steven's house on the left top of Mossdeep
Yes, by using the HM Dive.
Steven gives you the HM containing Dive he lives in mossdeep city.
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.
Dive is not an HM in leafgreen you can't get it unless you trade a Pokemon that knows Dive from ruby or sapphire or emerald but it will not work in leafgreen unless your in battle.
go to mossdeep city. Go to the house behind the house that's to the left of the Pokemon center. this is steven's house. talk to him, and he will give you HM Dive.
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.