It is totally true.

From the mouth, of the beautiful Adam Hall

Love, is a lot like Pokemon. You're going to get a starter, and it's going to mean a lot to you. But throughout the game you'll run into plenty of other Pokemon. Some you'll use a Pokeball to catch, and others you'll use a Great Ball or even an Ultra Ball. You're going to run into a couple of rare Pokemon and even a few legendary Pokemon. You might catch them and you might not, but no matter what you do; save your Master Ball. Save your Master Ball for that one Pokemon, that one Pokemon that is truly legendary.