Gold/Silver/Crystal
Ruby/Sapphire/Emerald
Diamond/Pearl/Platinum
Heartgold/Soulsilver
OR/AS
Those games require waterfall in order to progress the game.
Source- Experience from playing these games
(G/S/C, to reach Kanto through Tohjo Falls; R/S/E, you need it in order to get to Ever Grande City; D/P/P you need it for Victory Road)
