HM03 is surf
There's no Dive HM on Pokemon Leaf Green.
No its not an HM in leafgreen.
On route 16.
In icefall cave.
you cant
Surf is a HM so you can teach it to multiple pokemon.
The HM's that are in leafgreen are: Cut, Fly, Surf, Strength, Flash, Rock Smash, Waterfall.
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.
There isn't one
you get it in the captains quarters.
Icefall cave.
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.