I think you are talking about manaphy, you can get it from beating Pokemon Ranger and getting the manaphy egg then transfering it to Pokemon Diamond or Pearl. Or you can go to a manaphy event to get it.
Get the waterfall hm!
you burn the game.
the hm 7 is water fall you get it in sootopolis city in sapphire game
HM 05 is flash
get a hm called dive attach it to a water type pokemon and go on water and use dive.
A HM is a move is a move that can be tought to as many Pokemon as you like but the Pokemon has to be able.
go to icefall cave and it will be in there
evolve a zigzagoon into linoone as in its best known as and hm slave... rest are useful... such as fly for a flying pokemon dive for a water pokemon etc...
The Pokemon that can learn any move from TM's and HM's is Mew.
it is water fall and it is in ice fall cave
He isn't in Pokemon Emerald. He is only in pokemon Blue,Red, and Yellow. Sorry.
Zigzagoon and liloone