You don't learn you just gain the ability to when you get the sacred gift: the water dragon's scale. to do this you must activate the light tower in Skyloft( over the course of the game you shall learn how to activate the tower). you must travel into the thunder head figure out the puzzle to make the bridge leading to the largest building in that area. you shall learn a song in the building. Now, dowse for a gate to the SILENT REALM where you shall complete a trial the reward for this is the WATER DRAGON'S SCALE which allows you to swim and spin under water.
PS. by completing the second trial you get the DUAL CLAWSHOTS which are used for grabbing onto out of reach vines as well as those targets you see everywhere.
You have to get the Water Dragon Scale by completing Farores Trial in Faron woods
You must have acquired the Water Dragon's Scale. This is recieved by following the main questline
keep on leveling but in dive to the heart if yu pick the shield and give up the sword you'll learn it fast
Yes spheal can learn dive as well as its evolved forms
Dive is not an HM/TM anymore so it can't learn dive, but you can get it from a different region so if you trade a Pokemon holding that move then take it off them it can learn dive.
Wailmer EDIT: I think Wailmer can only learn dive.
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.
You have to get them to learn the move dive.
No he can't But he can learn Surf
to dive mor than six meters you must go to the fishing hole as an adult and catch a twenty pound fish the guy will give you a scale that allows you to dive deaper to catc hthe fish i suggest you go out on the middle log in the middle then cast from there right by that log is a really big fish try to catch him
It can't learn it whatsoever
Dewgong learns Dive at level 45.