There is NO SUCH THING in the original Pokemon Blue. These are the original HMs from Pokemon Blue, Red and Yellow:
HM01: CUT
HM02: FLY
HM03: SURF
HM04: STRENGTH
HM05: FLASH
HM06: Blast (only obtainable through beating elite four 100 times i have checked and is working)
This is Fire Red's HM list (I have this game and I am looking at it now), which is the same as Leaf Green:
HM01: CUT
HM02: FLY
HM03: SURF
HM04: STRENGTH
HM05: FLASH
HM06: ROCK SMASH
HM07: WATERFALL
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There is no move deleter in Pokemon Blue - however, there are Gameboy Genie and GameShark codes to aid in the removal of HM moves from the early games.
you get it from oak after beating blue
Naturally? No. By HM? Yes.
There is no such thing as HM 9 in pokemon, the highest number HM is 8
Waterfall is HM07 in Pokemon Gold, Silver and Crystal only. There are 2 Pokemon in Red and Blue who can learn it naturally (Goldeen and Seaking) however because its an 'old' attack, you may trade over some red or blue Pokemon, teach it to them in Gold or silver and trade them back. This is the only NEW HM that can be taught to old Red and Blue Pokemon, HM06 Whirlpool doesn't exist in red and blue.Waterfull is not an HM in Pokemon Red or Blue. The only Pokemon that know Waterfall in those games are Goldeen and Seaking, which Goldeen can learn Waterfall at level 37, while Seaking is at level 39 in Generation I.