There is no secret or hidden trick to finding Latias or Latios. Well you can use a Action Replay or a Game Shark but I'm talking about not cheating. You find him randomly. I was playing Saphire trying to Find the Regi Pokemon while I was Surfing, and i got into a wild Pokemon battle with Latias without even trying to find him. So the best way to find him is to not try to find him.
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You find it in the team aqua hideout.
Latiasyou cant find latias in Pokemon ruby you can only find it in sapphire. in Pokemon ruby you get latios no, you get latias in ruby and latios in sapphire because of the colour, Latias is red means ruby,latios is blue so means sapphire. your right above me but you got it mixed up. No its latias in sapphire and latios in ruby trust me i took forever trying to catch latias in sapphire and i finally did.
You find HM08 Waterfall on BF4 of the Cave of Origin
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the movie latios and latias come out on is in Pokemon heros the 5th movie