If you have the Pokemon Dream Radar on the 3DS, after you catch Landorus, you can get the Gen. 4 cover legendaries if you insert that game into the 3DS. : r/pokemon
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Serebii.net - On this day in 2012, ten years ago, Pokémon Dream Radar, known in Japan as Pokémon AR Searcher, was first released in Japan. This small game was available on the