If I remember correctly, the "Catch 'em all" motto was dropped several years ago.Now, in regards to the other user whose name I don't remember. "Catch them all is an american thing, it doesn't exist in Japan, so it's value in the world is zero". Something about those lines. Sure dude.
Im sorry but North America is not the World. Here, in Spain, "Gotta Catch Them All" is also the catchphrase the series is known for ("¡Hazte con todos!), so is in Latin America, which is massive. And I'm pretty sure its the same in, at least, all Europe. So yes. If "Gotta Catch Them All" is a thing in literally the entire world EXCEPT Japan, it has an impact and it doesn't matter if it is or not a thing in Japan. Pokémon is not Japan, Pokémon is a worldwide sucess, but ey, if you want to believe that just because in Japan it isn't a thing it shouldn't have an impact, even if it is a thing in the entire world outside Japan, sure.