Investigating just a bit further I stumpled upon the FTP access that EmuMovies offers. On their FTP servers the game is always listed as
"Legend of Zelda, The - A Link to the Past (USA)"
Putting in the game's title like that (in launchbox's game title) shows the correct downloads in the "download graphics/media" section for emumovies!
so I think it's an issue with the wording of the title (the word "the" must be at the end of the string, separated with a comma and not at the beginning). I suggest the string should be manipulated accordingly before passing it into the search engine of emumovies (could be a bit problematic because the word "the" title is not put at the actual end of the string but the end of the series title... it's not "Legend of Zelda - A Link to the past, the" after all...)
The reason for the issue with the Pokémon game is the é in the "Pokémon" title, which Launchbox DB does list but EmuMovies doesn't. I suggest an overhaul of the EmuMovies Search String, maybe with multiple tries, using special characters like é the first time and subsequently removing special characters and trying various combinations of the title's words (see the "the" problem).